OriolAbril: Example of the current plot:

```python
import arviz as az
idata1 = az.load_arviz_data("centered_eight")
idata2 = az.load_arviz_data("non_centered_eight")

az.plot_pointwise_elpd({"centered model": idata1, "non centered model": idata2})
```

![image](https://user-images.githubusercontent.com/23738400/58267529-1a2fb500-7d84-11e9-9343-66af682f5412.png)

    az.plot_pointwise_elpd(
        {"centered model": idata1, "non centered model": idata2}, 
        coords={"school": ["Choate", "Deerfield", "Mt. Hermon"]}
    )

![image](https://user-images.githubusercontent.com/23738400/58267561-29aefe00-7d84-11e9-9162-61d9f3888d66.png)

diff --git a/arviz/plots/__init__.py b/arviz/plots/__init__.py
index 0461500..653f680 100644
--- a/arviz/plots/__init__.py
+++ b/arviz/plots/__init__.py
@@ -6,6 +6,7 @@ from .energyplot import plot_energy
 from .forestplot import plot_forest
 from .kdeplot import plot_kde, _fast_kde, _fast_kde_2d
 from .parallelplot import plot_parallel
+from .elpdplot import plot_elpd
 from .posteriorplot import plot_posterior
 from .traceplot import plot_trace
 from .pairplot import plot_pair
@@ -28,6 +29,7 @@ __all__ = [
     "_fast_kde",
     "_fast_kde_2d",
     "plot_parallel",
+    "plot_elpd",
     "plot_posterior",
     "plot_trace",
     "plot_pair",
diff --git a/arviz/plots/elpdplot.py b/arviz/plots/elpdplot.py
new file mode 100644
index 0000000..b51b07e
--- /dev/null
+++ b/arviz/plots/elpdplot.py
@@ -0,0 +1,276 @@
+"""Plot pointwise elpd estimations of inference data."""
+import numpy as np
+import matplotlib.pyplot as plt
+import matplotlib.cm as cm
+from matplotlib.ticker import NullFormatter
+from matplotlib.lines import Line2D
+
+from ..data import convert_to_inference_data
+from .plot_utils import (
+    _scale_fig_size,
+    get_coords,
+    color_from_dim,
+    format_coords_as_labels,
+    set_xticklabels,
+)
+from ..stats import waic, loo, ELPDData
+
+
+def plot_elpd(
+    compare_dict,
+    color=None,
+    xlabels=False,
+    figsize=None,
+    textsize=None,
+    coords=None,
+    legend=False,
+    threshold=None,
+    ax=None,
+    ic="waic",
+    scale="deviance",
+    plot_kwargs=None,
+):
+    """
+    Plot a scatter or hexbin matrix of the sampled parameters.
+
+    Parameters
+    ----------
+    compare_dict : mapping, str -> ELPDData or InferenceData
+        A dictionary mapping the model name to the object containing its inference data or
+        the result of `waic`/`loo` functions.
+        Refer to az.convert_to_inference_data for details on possible dict items
+    color : str or array_like, optional
+        Colors of the scatter plot, if color is a str all dots will have the same color,
+        if it is the size of the observations, each dot will have the specified color,
+        otherwise, it will be interpreted as a list of the dims to be used for the color code
+    xlabels : bool, optional
+        Use coords as xticklabels
+    figsize : figure size tuple, optional
+        If None, size is (8 + numvars, 8 + numvars)
+    textsize: int, optional
+        Text size for labels. If None it will be autoscaled based on figsize.
+    coords : mapping, optional
+        Coordinates of points to plot. **All** values are used for computation, but only a
+        a subset can be plotted for convenience.
+    legend : bool, optional
+        Include a legend to the plot. Only taken into account when color argument is a dim name.
+    threshold : float
+        If some elpd difference is larger than `threshold * elpd.std()`, show its label. If
+        `None`, no observations will be highlighted.
+    ax: axes, optional
+        Matplotlib axes
+    ic : str, optional
+        Information Criterion (WAIC or LOO) used to compare models. Default WAIC. Only taken
+        into account when input is InferenceData.
+    scale : str, optional
+        scale argument passed to az.waic or az.loo, see their docs for details. Only taken
+        into account when input is InferenceData.
+    plot_kwargs : dicts, optional
+        Additional keywords passed to ax.plot
+
+    Returns
+    -------
+    ax : matplotlib axes
+
+    Examples
+    --------
+    Compare pointwise WAIC for centered and non centered models of the 8school problem
+
+    .. plot::
+        :context: close-figs
+
+        >>> import arviz as az
+        >>> idata1 = az.load_arviz_data("centered_eight")
+        >>> idata2 = az.load_arviz_data("non_centered_eight")
+        >>> az.plot_elpd(
+        >>>     {"centered model": idata1, "non centered model": idata2},
+        >>>     xlabels=True
+        >>> )
+
+    """
+    valid_ics = ["waic", "loo"]
+    ic = ic.lower()
+    if ic not in valid_ics:
+        raise ValueError(
+            ("Information Criteria type {} not recognized." "IC must be in {}").format(
+                ic, valid_ics
+            )
+        )
+    ic_fun = waic if ic == "waic" else loo
+
+    # Make sure all object are ELPDData
+    for k, item in compare_dict.items():
+        if not isinstance(item, ELPDData):
+            compare_dict[k] = ic_fun(convert_to_inference_data(item), pointwise=True, scale=scale)
+    ics = [elpd_data.index[0] for elpd_data in compare_dict.values()]
+    if not all(x == ics[0] for x in ics):
+        raise SyntaxError(
+            "All Information Criteria must be of the same kind, but both loo and waic data present"
+        )
+    ic = ics[0]
+    scales = [elpd_data["{}_scale".format(ic)] for elpd_data in compare_dict.values()]
+    if not all(x == scales[0] for x in scales):
+        raise SyntaxError(
+            "All Information Criteria must be on the same scale, but {} are present".format(
+                set(scales)
+            )
+        )
+    numvars = len(compare_dict)
+    models = list(compare_dict.keys())
+
+    if coords is None:
+        coords = {}
+
+    if plot_kwargs is None:
+        plot_kwargs = {}
+    plot_kwargs.setdefault("marker", "+")
+
+    pointwise_data = [
+        get_coords(compare_dict[model]["{}_i".format(ic)], coords) for model in models
+    ]
+    xdata = np.arange(pointwise_data[0].size)
+
+    if isinstance(color, str):
+        if color in pointwise_data[0].dims:
+            colors, color_mapping = color_from_dim(pointwise_data[0], color)
+            if legend:
+                cmap_name = plot_kwargs.pop("cmap", plt.rcParams["image.cmap"])
+                markersize = plot_kwargs.pop("s", plt.rcParams["lines.markersize"])
+                cmap = getattr(cm, cmap_name)
+                handles = [
+                    Line2D(
+                        [],
+                        [],
+                        color=cmap(float_color),
+                        label=coord,
+                        ms=markersize,
+                        lw=0,
+                        **plot_kwargs
+                    )
+                    for coord, float_color in color_mapping.items()
+                ]
+                plot_kwargs.setdefault("cmap", cmap_name)
+                plot_kwargs.setdefault("s", markersize ** 2)
+            plot_kwargs.setdefault("c", colors)
+        else:
+            plot_kwargs.setdefault("c", color)
+            legend = False
+    else:
+        legend = False
+        plot_kwargs.setdefault("c", color)
+
+    if xlabels:
+        coord_labels = format_coords_as_labels(pointwise_data[0])
+
+    if numvars < 2:
+        raise Exception("Number of models to compare must be 2 or greater.")
+
+    if numvars == 2:
+        (figsize, ax_labelsize, titlesize, xt_labelsize, _, markersize) = _scale_fig_size(
+            figsize, textsize, numvars - 1, numvars - 1
+        )
+        plot_kwargs.setdefault("s", markersize ** 2)
+
+        if ax is None:
+            fig, ax = plt.subplots(figsize=figsize, constrained_layout=(not xlabels and not legend))
+
+        ydata = pointwise_data[0] - pointwise_data[1]
+        ax.scatter(xdata, ydata, **plot_kwargs)
+        if threshold is not None:
+            ydata = ydata.values.flatten()
+            diff_abs = np.abs(ydata - ydata.mean())
+            bool_ary = diff_abs > threshold * ydata.std()
+            try:
+                coord_labels
+            except NameError:
+                coord_labels = xdata.astype(str)
+            outliers = np.argwhere(bool_ary).squeeze()
+            for outlier in outliers:
+                label = coord_labels[outlier]
+                ax.text(
+                    outlier,
+                    ydata[outlier],
+                    label,
+                    horizontalalignment="center",
+                    verticalalignment="bottom" if ydata[outlier] > 0 else "top",
+                    fontsize=0.8 * xt_labelsize,
+                )
+
+        ax.set_title("{} - {}".format(*models), fontsize=titlesize, wrap=True)
+        ax.set_ylabel("ELPD difference", fontsize=ax_labelsize, wrap=True)
+        ax.tick_params(labelsize=xt_labelsize)
+        if xlabels:
+            set_xticklabels(ax, coord_labels)
+            fig.autofmt_xdate()
+        if legend:
+            ncols = len(handles) // 6 + 1
+            ax.legend(handles=handles, ncol=ncols, title=color)
+
+    else:
+        (figsize, ax_labelsize, titlesize, xt_labelsize, _, markersize) = _scale_fig_size(
+            figsize, textsize, numvars - 2, numvars - 2
+        )
+        plot_kwargs.setdefault("s", markersize ** 2)
+
+        if ax is None:
+            fig, ax = plt.subplots(
+                numvars - 1,
+                numvars - 1,
+                figsize=figsize,
+                constrained_layout=(not xlabels and not legend),
+            )
+
+        for i in range(0, numvars - 1):
+            var1 = pointwise_data[i]
+
+            for j in range(0, numvars - 1):
+                if j < i:
+                    ax[j, i].axis("off")
+                    continue
+
+                var2 = pointwise_data[j + 1]
+                ax[j, i].scatter(xdata, var1 - var2, **plot_kwargs)
+                if threshold is not None:
+                    ydata = (var1 - var2).values.flatten()
+                    diff_abs = np.abs(ydata - ydata.mean())
+                    bool_ary = diff_abs > threshold * ydata.std()
+                    try:
+                        coord_labels
+                    except NameError:
+                        coord_labels = xdata.astype(str)
+                    outliers = np.argwhere(bool_ary).squeeze()
+                    for outlier in outliers:
+                        label = coord_labels[outlier]
+                        ax[j, i].text(
+                            outlier,
+                            ydata[outlier],
+                            label,
+                            horizontalalignment="center",
+                            verticalalignment="bottom" if ydata[outlier] > 0 else "top",
+                            fontsize=0.8 * xt_labelsize,
+                        )
+
+                if j + 1 != numvars - 1:
+                    ax[j, i].axes.get_xaxis().set_major_formatter(NullFormatter())
+                    ax[j, i].set_xticks([])
+                elif xlabels:
+                    set_xticklabels(ax[j, i], coord_labels)
+
+                if i != 0:
+                    ax[j, i].axes.get_yaxis().set_major_formatter(NullFormatter())
+                    ax[j, i].set_yticks([])
+                else:
+                    ax[j, i].set_ylabel("ELPD difference", fontsize=ax_labelsize, wrap=True)
+
+                ax[j, i].tick_params(labelsize=xt_labelsize)
+                ax[j, i].set_title(
+                    "{} - {}".format(models[i], models[j + 1]), fontsize=titlesize, wrap=True
+                )
+        if xlabels:
+            fig.autofmt_xdate()
+        if legend:
+            ncols = len(handles) // 6 + 1
+            ax[0, 1].legend(
+                handles=handles, ncol=ncols, title=color, bbox_to_anchor=(0, 1), loc="upper left"
+            )
+    return ax
diff --git a/arviz/plots/plot_utils.py b/arviz/plots/plot_utils.py
index 82c1648..512a239 100644
--- a/arviz/plots/plot_utils.py
+++ b/arviz/plots/plot_utils.py
@@ -375,3 +375,56 @@ def get_coords(data, coords):
                 " dimensions are valid. {}"
             ).format(err)
         )
+
+
+def color_from_dim(dataarray, dim_name):
+    """Return colors and color mapping of a DataArray using coord values as color code.
+
+    Parameters
+    ----------
+    dataarray : xarray.DataArray
+    dim_name : str
+        dimension whose coordinates will be used as color code.
+
+    Returns
+    -------
+    colors : array of floats
+        Array of colors (as floats for use with a cmap) for each element in the dataarray.
+    color_mapping : mapping coord_value -> float
+        Mapping from coord values to corresponding color
+    """
+    present_dims = dataarray.dims
+    coord_values = dataarray[dim_name].values
+    unique_coords = set(coord_values)
+    color_mapping = {coord: num / len(unique_coords) for num, coord in enumerate(unique_coords)}
+    if len(present_dims) > 1:
+        multi_coords = dataarray.coords.to_index()
+        coord_idx = present_dims.index(dim_name)
+        colors = [color_mapping[coord[coord_idx]] for coord in multi_coords]
+    else:
+        colors = [color_mapping[coord] for coord in coord_values]
+    return colors, color_mapping
+
+
+def format_coords_as_labels(dataarray):
+    """Format 1d or multi-d dataarray coords as strings."""
+    coord_labels = dataarray.coords.to_index().values
+    if isinstance(coord_labels[0], tuple):
+        fmt = ", ".join(["{}" for _ in coord_labels[0]])
+        coord_labels[:] = [fmt.format(*x) for x in coord_labels]
+    else:
+        coord_labels[:] = ["{}".format(s) for s in coord_labels]
+    return coord_labels
+
+
+def set_xticklabels(ax, coord_labels):
+    """Set xticklabels to label list using Matplotlib default formatter."""
+    ax.xaxis.get_major_locator().set_params(nbins=9, steps=[1, 2, 5, 10])
+    xticks = ax.get_xticks().astype(np.int64)
+    xticks = xticks[(xticks >= 0) & (xticks < len(coord_labels))]
+    if len(xticks) > len(coord_labels):
+        ax.set_xticks(np.arange(len(coord_labels)))
+        ax.set_xticklabels(coord_labels)
+    else:
+        ax.set_xticks(xticks)
+        ax.set_xticklabels(coord_labels[xticks])
diff --git a/arviz/stats/__init__.py b/arviz/stats/__init__.py
index 1fa258c..b4951f4 100644
--- a/arviz/stats/__init__.py
+++ b/arviz/stats/__init__.py
@@ -15,6 +15,7 @@ __all__ = [
     "summary",
     "waic",
     "effective_sample_size",
+    "ELPDData",
     "ess",
     "rhat",
     "mcse",
diff --git a/arviz/stats/stats.py b/arviz/stats/stats.py
index 6ace9c7..f56f082 100644
--- a/arviz/stats/stats.py
+++ b/arviz/stats/stats.py
@@ -12,7 +12,12 @@ import xarray as xr
 
 from ..data import convert_to_inference_data, convert_to_dataset
 from .diagnostics import _multichain_statistics, _mc_error, ess
-from .stats_utils import make_ufunc as _make_ufunc, logsumexp as _logsumexp
+from .stats_utils import (
+    make_ufunc as _make_ufunc,
+    wrap_xarray_ufunc as _wrap_xarray_ufunc,
+    logsumexp as _logsumexp,
+    ELPDData,
+)
 from ..utils import _var_names
 
 _log = logging.getLogger(__name__)
@@ -225,9 +230,9 @@ def compare(
         for idx, val in enumerate(ics.index):
             res = ics.loc[val]
             if scale_value < 0:
-                diff = res[ic_i] - min_ic_i_val
+                diff = (res[ic_i] - min_ic_i_val).values
             else:
-                diff = min_ic_i_val - res[ic_i]
+                diff = (min_ic_i_val - res[ic_i]).values
             d_ic = np.sum(diff)
             d_std_err = np.sqrt(len(diff) * np.var(diff))
             std_err = ses.loc[val]
@@ -360,7 +365,7 @@ def loo(data, pointwise=False, reff=None, scale="deviance"):
 
     Returns
     -------
-    pandas.Series with the following columns:
+    pandas.Series with the following rows:
     loo : approximated Leave-one-out cross-validation
     loo_se : standard error of loo
     p_loo : effective number of parameters
@@ -371,6 +376,9 @@ def loo(data, pointwise=False, reff=None, scale="deviance"):
     pareto_k : array of Pareto shape values, only if pointwise True
     loo_scale : scale of the loo results
 
+        The returned object has a custom print method that overrides pd.Series method. It is
+        specific to expected log pointwise predictive density (elpd) information criteria.
+
     Examples
     --------
     Calculate the LOO-CV of a model:
@@ -379,7 +387,15 @@ def loo(data, pointwise=False, reff=None, scale="deviance"):
 
         In [1]: import arviz as az
            ...: data = az.load_arviz_data("centered_eight")
-           ...: az.loo(data, pointwise=True)
+           ...: az.loo(data)
+
+    The custom print method can be seen here, printing only the relevant information and
+    with a specific organization. ``IC_loo`` stands for information criteria, which is the
+    `deviance` scale, the `log` (and `negative_log`) correspond to ``elpd`` (and ``-elpd``)
+
+    .. ipython::
+
+        In [2]: az.loo(data, pointwise=True, scale="log")
 
     """
     inference_data = convert_to_inference_data(data)
@@ -392,9 +408,10 @@ def loo(data, pointwise=False, reff=None, scale="deviance"):
         raise TypeError("Data must include log_likelihood in sample_stats")
     posterior = inference_data.posterior
     log_likelihood = inference_data.sample_stats.log_likelihood
-    n_samples = log_likelihood.chain.size * log_likelihood.draw.size
-    new_shape = (n_samples, np.product(log_likelihood.shape[2:]))
-    log_likelihood = log_likelihood.values.reshape(*new_shape)
+    log_likelihood = log_likelihood.stack(samples=("chain", "draw"))
+    shape = log_likelihood.shape
+    n_samples = shape[-1]
+    n_data_points = np.product(shape[:-1])
 
     if scale.lower() == "deviance":
         scale_value = -2
@@ -430,29 +447,60 @@ def loo(data, pointwise=False, reff=None, scale="deviance"):
         )
         warn_mg = True
 
-    loo_lppd_i = scale_value * _logsumexp(log_weights, axis=0)
-    loo_lppd = loo_lppd_i.sum()
-    loo_lppd_se = (len(loo_lppd_i) * np.var(loo_lppd_i)) ** 0.5
-
-    lppd = np.sum(_logsumexp(log_likelihood, axis=0, b_inv=log_likelihood.shape[0]))
+    ufunc_kwargs = {"n_dims": 1, "ravel": False}
+    kwargs = {"input_core_dims": [["samples"]]}
+    loo_lppd_i = scale_value * _wrap_xarray_ufunc(
+        _logsumexp, log_weights, ufunc_kwargs=ufunc_kwargs, **kwargs
+    )
+    loo_lppd = loo_lppd_i.values.sum()
+    loo_lppd_se = (n_data_points * np.var(loo_lppd_i.values)) ** 0.5
+
+    lppd = np.sum(
+        _wrap_xarray_ufunc(
+            _logsumexp,
+            log_likelihood,
+            func_kwargs={"b_inv": n_samples},
+            ufunc_kwargs=ufunc_kwargs,
+            **kwargs
+        ).values
+    )
     p_loo = lppd - loo_lppd / scale_value
 
     if pointwise:
         if np.equal(loo_lppd, loo_lppd_i).all():  # pylint: disable=no-member
             warnings.warn(
-                """The point-wise LOO is the same with the sum LOO, please double check
-                          the Observed RV in your model to make sure it returns element-wise logp.
-                          """
+                "The point-wise LOO is the same with the sum LOO, please double check "
+                "the Observed RV in your model to make sure it returns element-wise logp."
             )
-        return pd.Series(
-            data=[loo_lppd, loo_lppd_se, p_loo, warn_mg, loo_lppd_i, pareto_shape, scale],
-            index=["loo", "loo_se", "p_loo", "warning", "loo_i", "pareto_k", "loo_scale"],
+        return ELPDData(
+            data=[
+                loo_lppd,
+                loo_lppd_se,
+                p_loo,
+                n_samples,
+                n_data_points,
+                warn_mg,
+                loo_lppd_i.rename("loo_i"),
+                pareto_shape,
+                scale,
+            ],
+            index=[
+                "loo",
+                "loo_se",
+                "p_loo",
+                "n_samples",
+                "n_data_points",
+                "warning",
+                "loo_i",
+                "pareto_k",
+                "loo_scale",
+            ],
         )
 
     else:
-        return pd.Series(
-            data=[loo_lppd, loo_lppd_se, p_loo, warn_mg, scale],
-            index=["loo", "loo_se", "p_loo", "warning", "loo_scale"],
+        return ELPDData(
+            data=[loo_lppd, loo_lppd_se, p_loo, n_samples, n_data_points, warn_mg, scale],
+            index=["loo", "loo_se", "p_loo", "n_samples", "n_data_points", "warning", "loo_scale"],
         )
 
 
@@ -463,7 +511,7 @@ def psislw(log_weights, reff=1.0):
     Parameters
     ----------
     log_weights : array
-        Array of size (n_samples, n_observations)
+        Array of size (n_observations, n_samples)
     reff : float
         relative MCMC efficiency, `ess / n`
 
@@ -474,57 +522,92 @@ def psislw(log_weights, reff=1.0):
     kss : array
         Pareto tail indices
     """
-    rows, cols = log_weights.shape
-
-    log_weights_out = np.copy(log_weights, order="F")
-    kss = np.empty(cols)
-
+    if hasattr(log_weights, "samples"):
+        n_samples = len(log_weights.samples)
+        shape = [size for size, dim in zip(log_weights.shape, log_weights.dims) if dim != "samples"]
+    else:
+        n_samples = log_weights.shape[-1]
+        shape = log_weights.shape[:-1]
     # precalculate constants
-    cutoff_ind = -int(np.ceil(min(rows / 5.0, 3 * (rows / reff) ** 0.5))) - 1
+    cutoff_ind = -int(np.ceil(min(n_samples / 5.0, 3 * (n_samples / reff) ** 0.5))) - 1
     cutoffmin = np.log(np.finfo(float).tiny)  # pylint: disable=no-member, assignment-from-no-return
     k_min = 1.0 / 3
 
-    # loop over sets of log weights
-    for i, x in enumerate(log_weights_out.T):
-        # improve numerical accuracy
-        x -= np.max(x)
-        # sort the array
-        x_sort_ind = np.argsort(x)
-        # divide log weights into body and right tail
-        xcutoff = max(x[x_sort_ind[cutoff_ind]], cutoffmin)
-
-        expxcutoff = np.exp(xcutoff)
-        tailinds, = np.where(x > xcutoff)  # pylint: disable=unbalanced-tuple-unpacking
-        x_tail = x[tailinds]
-        tail_len = len(x_tail)
-        if tail_len <= 4:
-            # not enough tail samples for gpdfit
-            k = np.inf
-        else:
-            # order of tail samples
-            x_tail_si = np.argsort(x_tail)
-            # fit generalized Pareto distribution to the right tail samples
-            x_tail = np.exp(x_tail) - expxcutoff
-            k, sigma = _gpdfit(x_tail[x_tail_si])
-
-            if k >= k_min:
-                # no smoothing if short tail or GPD fit failed
-                # compute ordered statistic for the fit
-                sti = np.arange(0.5, tail_len) / tail_len
-                smoothed_tail = _gpinv(sti, k, sigma)
-                smoothed_tail = np.log(  # pylint: disable=assignment-from-no-return
-                    smoothed_tail + expxcutoff
-                )
-                # place the smoothed tail into the output array
-                x[tailinds[x_tail_si]] = smoothed_tail
-                # truncate smoothed values to the largest raw weight 0
-                x[x > 0] = 0
-        # renormalize weights
-        x -= _logsumexp(x)
-        # store tail index k
-        kss[i] = k
+    # create output array with proper dimensions
+    out = tuple([np.empty_like(log_weights), np.empty(shape)])
+
+    # define kwargs
+    func_kwargs = {"cutoff_ind": cutoff_ind, "cutoffmin": cutoffmin, "k_min": k_min, "out": out}
+    ufunc_kwargs = {"n_dims": 1, "n_output": 2, "ravel": False, "check_shape": False}
+    kwargs = {"input_core_dims": [["samples"]], "output_core_dims": [["sample"], []]}
+    log_weights, pareto_shape = _wrap_xarray_ufunc(
+        _psislw, log_weights, ufunc_kwargs=ufunc_kwargs, func_kwargs=func_kwargs, **kwargs
+    )
+    if isinstance(log_weights, xr.DataArray):
+        log_weights = log_weights.rename("log_weights").rename(sample="samples")
+    if isinstance(pareto_shape, xr.DataArray):
+        pareto_shape = pareto_shape.rename("pareto_shape")
+    return log_weights, pareto_shape
+
+
+def _psislw(log_weights, cutoff_ind, cutoffmin, k_min=1.0 / 3):
+    """
+    Pareto smoothed importance sampling (PSIS) for a 1D vector.
+
+    Parameters
+    ----------
+    log_weights : array
+        Array of length n_observations
+    cutoff_ind : int
+    cutoffmin : float
+    k_min : float
 
-    return log_weights_out, kss
+    Returns
+    -------
+    lw_out : array
+        Smoothed log weights
+    kss : float
+        Pareto tail index
+    """
+    x = np.asarray(log_weights)
+
+    # improve numerical accuracy
+    x -= np.max(x)
+    # sort the array
+    x_sort_ind = np.argsort(x)
+    # divide log weights into body and right tail
+    xcutoff = max(x[x_sort_ind[cutoff_ind]], cutoffmin)
+
+    expxcutoff = np.exp(xcutoff)
+    tailinds, = np.where(x > xcutoff)  # pylint: disable=unbalanced-tuple-unpacking
+    x_tail = x[tailinds]
+    tail_len = len(x_tail)
+    if tail_len <= 4:
+        # not enough tail samples for gpdfit
+        k = np.inf
+    else:
+        # order of tail samples
+        x_tail_si = np.argsort(x_tail)
+        # fit generalized Pareto distribution to the right tail samples
+        x_tail = np.exp(x_tail) - expxcutoff
+        k, sigma = _gpdfit(x_tail[x_tail_si])
+
+        if k >= k_min:
+            # no smoothing if short tail or GPD fit failed
+            # compute ordered statistic for the fit
+            sti = np.arange(0.5, tail_len) / tail_len
+            smoothed_tail = _gpinv(sti, k, sigma)
+            smoothed_tail = np.log(  # pylint: disable=assignment-from-no-return
+                smoothed_tail + expxcutoff
+            )
+            # place the smoothed tail into the output array
+            x[tailinds[x_tail_si]] = smoothed_tail
+            # truncate smoothed values to the largest raw weight 0
+            x[x > 0] = 0
+    # renormalize weights
+    x -= _logsumexp(x)
+
+    return x, k
 
 
 def _gpdfit(ary):
@@ -814,10 +897,10 @@ def summary(
             (
                 mean,
                 sd,
-                mcse_mean,
-                mcse_sd,
                 hpd_lower,
                 hpd_higher,
+                mcse_mean,
+                mcse_sd,
                 ess_mean,
                 ess_sd,
                 ess_bulk,
@@ -829,10 +912,10 @@ def summary(
             (
                 "mean",
                 "sd",
-                "mcse_mean",
-                "mcse_sd",
                 "hpd_{:g}%".format(100 * alpha / 2),
                 "hpd_{:g}%".format(100 * (1 - alpha / 2)),
+                "mcse_mean",
+                "mcse_sd",
                 "ess_mean",
                 "ess_sd",
                 "ess_bulk",
@@ -841,14 +924,14 @@ def summary(
             )
         )
     if include_circ:
-        metrics.extend((circ_mean, circ_sd, circ_mcse, circ_hpd_lower, circ_hpd_higher))
+        metrics.extend((circ_mean, circ_sd, circ_hpd_lower, circ_hpd_higher, circ_mcse))
         metric_names.extend(
             (
                 "circular_mean",
                 "circular_sd",
-                "circular_mcse",
                 "circular_hpd_{:g}%".format(100 * alpha / 2),
                 "circular_hpd_{:g}%".format(100 * (1 - alpha / 2)),
+                "circular_mcse",
             )
         )
     metrics.extend(extra_metrics)
@@ -924,7 +1007,7 @@ def waic(data, pointwise=False, scale="deviance"):
 
     Returns
     -------
-    DataFrame with the following columns:
+    Series with the following rows:
     waic : widely available information criterion
     waic_se : standard error of waic
     p_waic : effective number parameters
@@ -934,9 +1017,12 @@ def waic(data, pointwise=False, scale="deviance"):
     waic_i : and array of the pointwise predictive accuracy, only if pointwise True
     waic_scale : scale of the waic results
 
+        The returned object has a custom print method that overrides pd.Series method. It is
+        specific to expected log pointwise predictive density (elpd) information criteria.
+
     Examples
     --------
-    Calculate the LOO-CV of a model:
+    Calculate the WAIC of a model:
 
     .. ipython::
 
@@ -944,6 +1030,9 @@ def waic(data, pointwise=False, scale="deviance"):
            ...: data = az.load_arviz_data("centered_eight")
            ...: az.waic(data, pointwise=True)
 
+    The custom print method can be seen here, printing only the relevant information and
+    with a specific organization. ``IC_loo`` stands for information criteria, which is the
+    `deviance` scale, the `log` (and `negative_log`) correspond to ``elpd`` (and ``-elpd``)
     """
     inference_data = convert_to_inference_data(data)
     for group in ("sample_stats",):
@@ -964,13 +1053,22 @@ def waic(data, pointwise=False, scale="deviance"):
     else:
         raise TypeError('Valid scale values are "deviance", "log", "negative_log"')
 
-    n_samples = log_likelihood.chain.size * log_likelihood.draw.size
-    new_shape = (n_samples, np.product(log_likelihood.shape[2:]))
-    log_likelihood = log_likelihood.values.reshape(*new_shape)
-
-    lppd_i = _logsumexp(log_likelihood, axis=0, b_inv=log_likelihood.shape[0])
+    log_likelihood = log_likelihood.stack(samples=("chain", "draw"))
+    shape = log_likelihood.shape
+    n_samples = shape[-1]
+    n_data_points = np.product(shape[:-1])
+
+    ufunc_kwargs = {"n_dims": 1, "ravel": False}
+    kwargs = {"input_core_dims": [["samples"]]}
+    lppd_i = _wrap_xarray_ufunc(
+        _logsumexp,
+        log_likelihood,
+        func_kwargs={"b_inv": n_samples},
+        ufunc_kwargs=ufunc_kwargs,
+        **kwargs
+    )
 
-    vars_lpd = np.var(log_likelihood, axis=0)
+    vars_lpd = log_likelihood.var(dim="samples")
     warn_mg = False
     if np.any(vars_lpd > 0.4):
         warnings.warn(
@@ -982,9 +1080,9 @@ def waic(data, pointwise=False, scale="deviance"):
         warn_mg = True
 
     waic_i = scale_value * (lppd_i - vars_lpd)
-    waic_se = (len(waic_i) * np.var(waic_i)) ** 0.5
-    waic_sum = np.sum(waic_i)
-    p_waic = np.sum(vars_lpd)
+    waic_se = (n_data_points * np.var(waic_i.values)) ** 0.5
+    waic_sum = np.sum(waic_i.values)
+    p_waic = np.sum(vars_lpd.values)
 
     if pointwise:
         if np.equal(waic_sum, waic_i).all():  # pylint: disable=no-member
@@ -993,12 +1091,38 @@ def waic(data, pointwise=False, scale="deviance"):
             the Observed RV in your model to make sure it returns element-wise logp.
             """
             )
-        return pd.Series(
-            data=[waic_sum, waic_se, p_waic, warn_mg, waic_i, scale],
-            index=["waic", "waic_se", "p_waic", "warning", "waic_i", "waic_scale"],
+        return ELPDData(
+            data=[
+                waic_sum,
+                waic_se,
+                p_waic,
+                n_samples,
+                n_data_points,
+                warn_mg,
+                waic_i.rename("waic_i"),
+                scale,
+            ],
+            index=[
+                "waic",
+                "waic_se",
+                "p_waic",
+                "n_samples",
+                "n_data_points",
+                "warning",
+                "waic_i",
+                "waic_scale",
+            ],
         )
     else:
-        return pd.Series(
-            data=[waic_sum, waic_se, p_waic, warn_mg, scale],
-            index=["waic", "waic_se", "p_waic", "warning", "waic_scale"],
+        return ELPDData(
+            data=[waic_sum, waic_se, p_waic, n_samples, n_data_points, warn_mg, scale],
+            index=[
+                "waic",
+                "waic_se",
+                "p_waic",
+                "n_samples",
+                "n_data_points",
+                "warning",
+                "waic_scale",
+            ],
         )
diff --git a/arviz/stats/stats_utils.py b/arviz/stats/stats_utils.py
index 91602c4..dc8a107 100644
--- a/arviz/stats/stats_utils.py
+++ b/arviz/stats/stats_utils.py
@@ -4,13 +4,14 @@ import logging
 import warnings
 
 import numpy as np
+import pandas as pd
 from scipy.fftpack import next_fast_len
 from scipy.stats.mstats import mquantiles
 from xarray import apply_ufunc
 
 _log = logging.getLogger(__name__)
 
-__all__ = ["autocorr", "autocov", "make_ufunc", "wrap_xarray_ufunc"]
+__all__ = ["autocorr", "autocov", "ELPDData", "make_ufunc", "wrap_xarray_ufunc"]
 
 
 def autocov(ary, axis=-1):
@@ -71,7 +72,9 @@ def autocorr(ary, axis=-1):
     return corr
 
 
-def make_ufunc(func, n_dims=2, n_output=1, index=Ellipsis, ravel=True):  # noqa: D202
+def make_ufunc(
+    func, n_dims=2, n_output=1, index=Ellipsis, ravel=True, check_shape=True
+):  # noqa: D202
     """Make ufunc from a function taking 1D array input.
 
     Parameters
@@ -87,6 +90,9 @@ def make_ufunc(func, n_dims=2, n_output=1, index=Ellipsis, ravel=True):  # noqa:
         Slice ndarray with `index`. Defaults to `Ellipsis`.
     ravel : bool, optional
         If true, ravel the ndarray before calling `func`.
+    check_shape: bool, optional
+        If false, do not check if the shape of the output is compatible with n_dims and
+        n_output.
 
     Returns
     -------
@@ -100,7 +106,7 @@ def make_ufunc(func, n_dims=2, n_output=1, index=Ellipsis, ravel=True):  # noqa:
         """General ufunc for single-output function."""
         if out is None:
             out = np.empty(ary.shape[:-n_dims])
-        else:
+        elif check_shape:
             if out.shape != ary.shape[:-n_dims]:
                 msg = "Shape incorrect for `out`: {}.".format(out.shape)
                 msg += " Correct shape is {}".format(ary.shape[:-n_dims])
@@ -115,7 +121,7 @@ def make_ufunc(func, n_dims=2, n_output=1, index=Ellipsis, ravel=True):  # noqa:
         element_shape = ary.shape[:-n_dims]
         if out is None:
             out = tuple(np.empty(element_shape) for _ in range(n_output))
-        else:
+        elif check_shape:
             raise_error = False
             correct_shape = tuple(element_shape for _ in range(n_output))
             if isinstance(out, tuple):
@@ -363,3 +369,59 @@ def not_valid(ary, check_nan=True, check_shape=True, nan_kwargs=None, shape_kwar
             _log.warning(error_msg)
 
     return nan_error | chain_error | draw_error
+
+
+BASE_FMT = """Computed from {{n_samples}} by {{n_points}} log-likelihood matrix
+
+{{0:{0}}} Estimate       SE
+{{scale}}_{{kind}} {{1:8.2f}}  {{2:7.2f}}
+p_{{kind:{1}}} {{3:8.2f}}        -"""
+POINTWISE_LOO_FMT = """------
+
+Pareto k diagnostic values:
+                         {{0:>{0}}} {{1:>6}}
+(-Inf, 0.5]   (good)     {{2:{0}d}} {{6:6.1f}}%
+ (0.5, 0.7]   (ok)       {{3:{0}d}} {{7:6.1f}}%
+   (0.7, 1]   (bad)      {{4:{0}d}} {{8:6.1f}}%
+   (1, Inf)   (very bad) {{5:{0}d}} {{9:6.1f}}%
+"""
+SCALE_DICT = {"deviance": "IC", "log": "elpd", "negative_log": "-elpd"}
+
+
+class ELPDData(pd.Series):  # pylint: disable=too-many-ancestors
+    """Class to contain the data from elpd information criterion like waic or loo."""
+
+    def __str__(self):
+        """Print elpd data in a user friendly way."""
+        kind = self.index[0]
+
+        if kind not in ("waic", "loo"):
+            raise ValueError("Invalid ELPDData object")
+
+        scale_str = SCALE_DICT[self["{}_scale".format(kind)]]
+        padding = len(scale_str) + len(kind) + 1
+        base = BASE_FMT.format(padding, padding - 2)
+        base = base.format(
+            "",
+            kind=kind,
+            scale=scale_str,
+            n_samples=self.n_samples,
+            n_points=self.n_data_points,
+            *self.values
+        )
+
+        if self.warning:
+            base += "\n\nThere has been a warning during the calculation. Please check the results."
+
+        if kind == "loo" and "pareto_k" in self:
+            counts, _ = np.histogram(self.pareto_k, bins=[-np.inf, 0.5, 0.7, 1, np.inf])
+            extended = POINTWISE_LOO_FMT.format(max(4, len(str(np.max(counts)))))
+            extended = extended.format(
+                "Count", "Pct.", *[*counts, *(counts / np.sum(counts) * 100)]
+            )
+            base = "\n".join([base, extended])
+        return base
+
+    def __repr__(self):
+        """Alias to ``__str__``."""
+        return self.__str__()
diff --git a/doc/api.rst b/doc/api.rst
index fd90fe2..5d53110 100644
--- a/doc/api.rst
+++ b/doc/api.rst
@@ -24,6 +24,7 @@ Plots
     plot_khat
     plot_pair
     plot_parallel
+    plot_elpd
     plot_posterior
     plot_ppc
     plot_rank
diff --git a/doc/logo/generate_logo.py b/doc/logo/generate_logo.py
index d21e443..a136769 100644
--- a/doc/logo/generate_logo.py
+++ b/doc/logo/generate_logo.py
@@ -27,7 +27,7 @@ plt.xlim(0, 0.9)
 bbox = Bbox([[0.75, 0.5], [5.4, 2.2]])
 
 #plt.savefig('logo_00.png', dpi=300,  bbox_inches=bbox, transparent=True)
-plt.text(x=0.04, y=-0.01, s='ArviZ',
+plt.text(x=0.04, y=-0.01, s='ArviZ', clip_on=True,
          fontdict={'name': 'ubuntu mono', 'fontsize': 62}, color='w')
 
 plt.savefig('ArviZ.png', dpi=300, bbox_inches=bbox, transparent=True)

Improve loo functionality
`loo` functionality should be more verbose and return more informative data. (see Model Selection lecture in StanCon Helsinki by @avehtari)

Also docstrings needs extensive examples for loo-usage.
diff --git a/arviz/tests/test_plots.py b/arviz/tests/test_plots.py
index b990408..7ac9c9b 100644
--- a/arviz/tests/test_plots.py
+++ b/arviz/tests/test_plots.py
@@ -7,7 +7,7 @@ import numpy as np
 import pytest
 
 from ..data import from_dict, load_arviz_data
-from ..stats import compare, psislw
+from ..stats import compare, psislw, loo, waic
 from .helpers import eight_schools_params  # pylint: disable=unused-import
 from ..plots import (
     plot_density,
@@ -28,6 +28,7 @@ from ..plots import (
     plot_hpd,
     plot_dist,
     plot_rank,
+    plot_elpd,
 )
 
 np.random.seed(0)
@@ -74,7 +75,56 @@ def create_model(seed=10):
         prior_predictive=prior_predictive,
         sample_stats_prior=sample_stats_prior,
         observed_data={"y": data["y"]},
-        dims={"y": ["obs_dim"]},
+        dims={"y": ["obs_dim"], "log_likelihood": ["obs_dim"]},
+        coords={"obs_dim": range(data["J"])},
+    )
+    return model
+
+
+def create_multidimensional_model(seed=10):
+    """Create model with fake data."""
+    np.random.seed(seed)
+    nchains = 4
+    ndraws = 500
+    ndim1 = 5
+    ndim2 = 7
+    data = {
+        "y": np.random.normal(size=(ndim1, ndim2)),
+        "sigma": np.random.normal(size=(ndim1, ndim2)),
+    }
+    posterior = {
+        "mu": np.random.randn(nchains, ndraws),
+        "tau": abs(np.random.randn(nchains, ndraws)),
+        "eta": np.random.randn(nchains, ndraws, ndim1, ndim2),
+        "theta": np.random.randn(nchains, ndraws, ndim1, ndim2),
+    }
+    posterior_predictive = {"y": np.random.randn(nchains, ndraws, ndim1, ndim2)}
+    sample_stats = {
+        "energy": np.random.randn(nchains, ndraws),
+        "diverging": np.random.randn(nchains, ndraws) > 0.90,
+        "log_likelihood": np.random.randn(nchains, ndraws, ndim1, ndim2),
+    }
+    prior = {
+        "mu": np.random.randn(nchains, ndraws) / 2,
+        "tau": abs(np.random.randn(nchains, ndraws)) / 2,
+        "eta": np.random.randn(nchains, ndraws, ndim1, ndim2) / 2,
+        "theta": np.random.randn(nchains, ndraws, ndim1, ndim2) / 2,
+    }
+    prior_predictive = {"y": np.random.randn(nchains, ndraws, ndim1, ndim2) / 2}
+    sample_stats_prior = {
+        "energy": np.random.randn(nchains, ndraws),
+        "diverging": (np.random.randn(nchains, ndraws) > 0.95).astype(int),
+    }
+    model = from_dict(
+        posterior=posterior,
+        posterior_predictive=posterior_predictive,
+        sample_stats=sample_stats,
+        prior=prior,
+        prior_predictive=prior_predictive,
+        sample_stats_prior=sample_stats_prior,
+        observed_data={"y": data["y"]},
+        dims={"y": ["dim1", "dim2"], "log_likelihood": ["dim1", "dim2"]},
+        coords={"dim1": range(ndim1), "dim2": range(ndim2)},
     )
     return model
 
@@ -88,6 +138,15 @@ def models():
     return Models()
 
 
+@pytest.fixture(scope="module")
+def multidim_models():
+    class Models:
+        model_1 = create_multidimensional_model(seed=10)
+        model_2 = create_multidimensional_model(seed=11)
+
+    return Models()
+
+
 @pytest.fixture(scope="function", autouse=True)
 def clean_plots(request, save_figs):
     """Close plots after each test, optionally save if --save is specified during test invocation"""
@@ -763,3 +822,104 @@ def test_fast_kde_cumulative(limits):
     data = np.random.normal(0, 1, 1000)
     density_fast = _fast_kde(data, xmin=limits[0], xmax=limits[1], cumulative=True)[0]
     np.testing.assert_almost_equal(round(density_fast[-1], 3), 1)
+
+
+@pytest.mark.parametrize(
+    "kwargs",
+    [
+        {},
+        {"ic": "loo"},
+        {"xlabels": True, "scale": "log"},
+        {"color": "obs_dim", "xlabels": True},
+        {"color": "obs_dim", "legend": True},
+        {"ic": "loo", "color": "blue", "coords": {"obs_dim": slice(2, 5)}},
+        {"color": np.random.uniform(size=8), "threshold": 0.1},
+    ],
+)
+@pytest.mark.parametrize("add_model", [False, True])
+@pytest.mark.parametrize("use_elpddata", [False, True])
+def test_plot_elpd(models, add_model, use_elpddata, kwargs):
+    model_dict = {"Model 1": models.model_1, "Model 2": models.model_2}
+    if add_model:
+        model_dict["Model 3"] = create_model(seed=12)
+
+    if use_elpddata:
+        ic = kwargs.get("ic", "waic")
+        scale = kwargs.get("scale", "deviance")
+        if ic == "waic":
+            model_dict = {k: waic(v, scale=scale, pointwise=True) for k, v in model_dict.items()}
+        else:
+            model_dict = {k: loo(v, scale=scale, pointwise=True) for k, v in model_dict.items()}
+
+    axes = plot_elpd(model_dict, **kwargs)
+    assert np.all(axes)
+    if add_model:
+        assert axes.shape[0] == axes.shape[1]
+        assert axes.shape[0] == len(model_dict) - 1
+
+
+@pytest.mark.parametrize(
+    "kwargs",
+    [
+        {},
+        {"ic": "loo"},
+        {"xlabels": True, "scale": "log"},
+        {"color": "dim1", "xlabels": True},
+        {"color": "dim2", "legend": True},
+        {"ic": "loo", "color": "blue", "coords": {"dim2": slice(2, 4)}},
+        {"color": np.random.uniform(size=35), "threshold": 0.1},
+    ],
+)
+@pytest.mark.parametrize("add_model", [False, True])
+@pytest.mark.parametrize("use_elpddata", [False, True])
+def test_plot_elpd_multidim(multidim_models, add_model, use_elpddata, kwargs):
+    model_dict = {"Model 1": multidim_models.model_1, "Model 2": multidim_models.model_2}
+    if add_model:
+        model_dict["Model 3"] = create_multidimensional_model(seed=12)
+
+    if use_elpddata:
+        ic = kwargs.get("ic", "waic")
+        scale = kwargs.get("scale", "deviance")
+        if ic == "waic":
+            model_dict = {k: waic(v, scale=scale, pointwise=True) for k, v in model_dict.items()}
+        else:
+            model_dict = {k: loo(v, scale=scale, pointwise=True) for k, v in model_dict.items()}
+
+    axes = plot_elpd(model_dict, **kwargs)
+    assert np.all(axes)
+    if add_model:
+        assert axes.shape[0] == axes.shape[1]
+        assert axes.shape[0] == len(model_dict) - 1
+
+
+def test_plot_elpd_bad_ic(models):
+    model_dict = {
+        "Model 1": waic(models.model_1, pointwise=True),
+        "Model 2": loo(models.model_2, pointwise=True),
+    }
+    with pytest.raises(ValueError):
+        plot_elpd(model_dict, ic="bad_ic")
+
+
+def test_plot_elpd_ic_error(models):
+    model_dict = {
+        "Model 1": waic(models.model_1, pointwise=True),
+        "Model 2": loo(models.model_2, pointwise=True),
+    }
+    with pytest.raises(SyntaxError):
+        plot_elpd(model_dict)
+
+
+def test_plot_elpd_scale_error(models):
+    model_dict = {
+        "Model 1": waic(models.model_1, pointwise=True),
+        "Model 2": waic(models.model_2, pointwise=True, scale="log"),
+    }
+    with pytest.raises(SyntaxError):
+        plot_elpd(model_dict)
+
+
+def test_plot_elpd_one_model(models):
+    model_dict = {"Model 1": models.model_1}
+    with pytest.raises(Exception):
+        plot_elpd(model_dict)
diff --git a/arviz/tests/test_stats.py b/arviz/tests/test_stats.py
index 165ec28..24ec39d 100644
--- a/arviz/tests/test_stats.py
+++ b/arviz/tests/test_stats.py
@@ -1,7 +1,7 @@
 # pylint: disable=redefined-outer-name
 from copy import deepcopy
 import numpy as np
-from numpy.testing import assert_almost_equal, assert_array_almost_equal
+from numpy.testing import assert_allclose, assert_array_almost_equal
 import pytest
 from scipy.stats import linregress
 from xarray import Dataset, DataArray
@@ -40,7 +40,7 @@ def test_r2_score():
     x = np.linspace(0, 1, 100)
     y = np.random.normal(x, 1)
     res = linregress(x, y)
-    assert_almost_equal(res.rvalue ** 2, r2_score(y, res.intercept + res.slope * x).r2, 2)
+    assert_allclose(res.rvalue ** 2, r2_score(y, res.intercept + res.slope * x).r2, 2)
 
 
 def test_r2_score_multivariate():
@@ -57,8 +57,8 @@ def test_compare_same(centered_eight, method):
     data_dict = {"first": centered_eight, "second": centered_eight}
 
     weight = compare(data_dict, method=method)["weight"]
-    assert_almost_equal(weight[0], weight[1])
-    assert_almost_equal(np.sum(weight), 1.0)
+    assert_allclose(weight[0], weight[1])
+    assert_allclose(np.sum(weight), 1.0)
 
 
 def test_compare_unknown_ic_and_method(centered_eight, non_centered_eight):
@@ -76,7 +76,7 @@ def test_compare_different(centered_eight, non_centered_eight, ic, method, scale
     model_dict = {"centered": centered_eight, "non_centered": non_centered_eight}
     weight = compare(model_dict, ic=ic, method=method, scale=scale)["weight"]
     assert weight["non_centered"] >= weight["centered"]
-    assert_almost_equal(np.sum(weight), 1.0)
+    assert_allclose(np.sum(weight), 1.0)
 
 
 def test_compare_different_size(centered_eight, non_centered_eight):
@@ -216,6 +216,15 @@ def test_waic_warning(centered_eight):
         assert waic(centered_eight, pointwise=True) is not None
 
 
+@pytest.mark.parametrize("scale", ["deviance", "log", "negative_log"])
+def test_waic_print(centered_eight, scale):
+    waic_data = waic(centered_eight, scale=scale).__repr__()
+    waic_pointwise = waic(centered_eight, scale=scale, pointwise=True).__repr__()
+    assert waic_data is not None
+    assert waic_pointwise is not None
+    assert waic_data == waic_pointwise
+
+
 def test_loo(centered_eight):
     assert loo(centered_eight) is not None
 
@@ -265,14 +274,22 @@ def test_loo_warning(centered_eight):
         assert loo(centered_eight, pointwise=True) is not None
 
 
+@pytest.mark.parametrize("scale", ["deviance", "log", "negative_log"])
+def test_loo_print(centered_eight, scale):
+    loo_data = loo(centered_eight, scale=scale).__repr__()
+    loo_pointwise = loo(centered_eight, scale=scale, pointwise=True).__repr__()
+    assert loo_data is not None
+    assert loo_pointwise is not None
+    assert len(loo_data) < len(loo_pointwise)
+    assert loo_data == loo_pointwise[: len(loo_data)]
+
+
 def test_psislw():
     data = load_arviz_data("centered_eight")
     pareto_k = loo(data, pointwise=True, reff=0.7)["pareto_k"]
     log_likelihood = data.sample_stats.log_likelihood  # pylint: disable=no-member
-    n_samples = log_likelihood.chain.size * log_likelihood.draw.size
-    new_shape = (n_samples,) + log_likelihood.shape[2:]
-    log_likelihood = log_likelihood.values.reshape(*new_shape)
-    assert_almost_equal(pareto_k, psislw(-log_likelihood, 0.7)[1])
+    log_likelihood = log_likelihood.stack(samples=("chain", "draw"))
+    assert_allclose(pareto_k, psislw(-log_likelihood, 0.7)[1])
 
 
 @pytest.mark.parametrize("probs", [True, False])
diff --git a/arviz/tests/test_stats_utils.py b/arviz/tests/test_stats_utils.py
index 53c9e10..1a23d47 100644
--- a/arviz/tests/test_stats_utils.py
+++ b/arviz/tests/test_stats_utils.py
@@ -4,7 +4,13 @@ from numpy.testing import assert_array_almost_equal
 import pytest
 from scipy.special import logsumexp
 
-from ..stats.stats_utils import logsumexp as _logsumexp, make_ufunc, wrap_xarray_ufunc, not_valid
+from ..stats.stats_utils import (
+    logsumexp as _logsumexp,
+    make_ufunc,
+    wrap_xarray_ufunc,
+    not_valid,
+    ELPDData,
+)
 
 
 @pytest.mark.parametrize("ary_dtype", [np.float64, np.float32, np.int32, np.int64])
@@ -198,3 +204,8 @@ def test_valid_shape():
     assert not_valid(
         np.ones((10, 10)), check_nan=False, shape_kwargs=dict(min_chains=100, min_draws=2)
     )
+
+
+def test_elpd_data_error():
+    with pytest.raises(ValueError):
+        ELPDData(data=[0, 1, 2], index=["not IC", "se", "p"]).__repr__()

pip install -e .
parse_log_pytest
requirements.txt
pytest pytest-cov coverage
apt-get update apt-get install -y gcc
3.6
requirements.txt
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
-e git+https://github.com/arviz-devs/arviz.git@f3aa3c53c8529bf055afbc0edf3ae2724bede5f1#egg=arviz
attrs==22.2.0
certifi==2021.5.30
cftime==1.6.0
coverage==6.2
cycler==0.11.0
importlib-metadata==4.8.3
iniconfig==1.1.1
kiwisolver==1.3.1
matplotlib==3.3.4
netCDF4==1.6.1
numpy==1.19.5
packaging==21.3
pandas==1.1.5
Pillow==8.4.0
pluggy==1.0.0
py==1.11.0
pyparsing==3.1.4
pytest==7.0.1
pytest-cov==4.0.0
python-dateutil==2.9.0.post0
pytz==2025.2
scipy==1.5.4
six==1.17.0
tomli==1.2.3
typing_extensions==4.1.1
xarray==0.16.2
zipp==3.6.0

name: arviz
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - ca-certificates=2025.2.25=h06a4308_0
  - certifi=2021.5.30=py36h06a4308_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.3=he6710b0_2
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0
  - openssl=1.1.1w=h7f8727e_0
  - pip=21.2.2=py36h06a4308_0
  - python=3.6.13=h12debd9_1
  - readline=8.2=h5eee18b_0
  - setuptools=58.0.4=py36h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - wheel=0.37.1=pyhd3eb1b0_0
  - xz=5.6.4=h5eee18b_1
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - attrs==22.2.0
      - cftime==1.6.0
      - coverage==6.2
      - cycler==0.11.0
      - importlib-metadata==4.8.3
      - iniconfig==1.1.1
      - kiwisolver==1.3.1
      - matplotlib==3.3.4
      - netcdf4==1.6.1
      - numpy==1.19.5
      - packaging==21.3
      - pandas==1.1.5
      - pillow==8.4.0
      - pluggy==1.0.0
      - py==1.11.0
      - pyparsing==3.1.4
      - pytest==7.0.1
      - pytest-cov==4.0.0
      - python-dateutil==2.9.0.post0
      - pytz==2025.2
      - scipy==1.5.4
      - six==1.17.0
      - tomli==1.2.3
      - typing-extensions==4.1.1
      - xarray==0.16.2
      - zipp==3.6.0
prefix: /opt/conda/envs/arviz

arviz/tests/test_plots.py::test_plot_density_float[kwargs0] arviz/tests/test_plots.py::test_plot_density_float[kwargs1] arviz/tests/test_plots.py::test_plot_density_float[kwargs2] arviz/tests/test_plots.py::test_plot_density_float[kwargs3] arviz/tests/test_plots.py::test_plot_density_float[kwargs4] arviz/tests/test_plots.py::test_plot_density_float[kwargs5] arviz/tests/test_plots.py::test_plot_density_float[kwargs6] arviz/tests/test_plots.py::test_plot_density_float[kwargs7] arviz/tests/test_plots.py::test_plot_density_float[kwargs8] arviz/tests/test_plots.py::test_plot_density_discrete arviz/tests/test_plots.py::test_plot_density_bad_kwargs arviz/tests/test_plots.py::test_plot_trace[kwargs0] arviz/tests/test_plots.py::test_plot_trace[kwargs1] arviz/tests/test_plots.py::test_plot_trace[kwargs2] arviz/tests/test_plots.py::test_plot_trace[kwargs3] arviz/tests/test_plots.py::test_plot_trace[kwargs4] arviz/tests/test_plots.py::test_plot_trace[kwargs5] arviz/tests/test_plots.py::test_plot_trace[kwargs6] arviz/tests/test_plots.py::test_plot_trace[kwargs7] arviz/tests/test_plots.py::test_plot_trace[kwargs8] arviz/tests/test_plots.py::test_plot_trace[kwargs9] arviz/tests/test_plots.py::test_plot_trace_max_plots_warning arviz/tests/test_plots.py::test_plot_forest[args_expected0-model_fits0] arviz/tests/test_plots.py::test_plot_forest[args_expected0-model_fits1] arviz/tests/test_plots.py::test_plot_forest[args_expected1-model_fits0] arviz/tests/test_plots.py::test_plot_forest[args_expected1-model_fits1] arviz/tests/test_plots.py::test_plot_forest[args_expected2-model_fits0] arviz/tests/test_plots.py::test_plot_forest[args_expected2-model_fits1] arviz/tests/test_plots.py::test_plot_forest[args_expected3-model_fits0] arviz/tests/test_plots.py::test_plot_forest[args_expected3-model_fits1] arviz/tests/test_plots.py::test_plot_forest[args_expected4-model_fits0] arviz/tests/test_plots.py::test_plot_forest[args_expected4-model_fits1] arviz/tests/test_plots.py::test_plot_forest[args_expected5-model_fits0] arviz/tests/test_plots.py::test_plot_forest[args_expected5-model_fits1] arviz/tests/test_plots.py::test_plot_forest[args_expected6-model_fits0] arviz/tests/test_plots.py::test_plot_forest[args_expected6-model_fits1] arviz/tests/test_plots.py::test_plot_forest[args_expected7-model_fits0] arviz/tests/test_plots.py::test_plot_forest[args_expected7-model_fits1] arviz/tests/test_plots.py::test_plot_forest_rope_exception arviz/tests/test_plots.py::test_plot_forest_single_value arviz/tests/test_plots.py::test_plot_forest_bad[model_fits0] arviz/tests/test_plots.py::test_plot_forest_bad[model_fits1] arviz/tests/test_plots.py::test_plot_energy[kde] arviz/tests/test_plots.py::test_plot_energy[hist] arviz/tests/test_plots.py::test_plot_energy_bad arviz/tests/test_plots.py::test_plot_parallel_raises_valueerror arviz/tests/test_plots.py::test_plot_parallel[None] arviz/tests/test_plots.py::test_plot_parallel[normal] arviz/tests/test_plots.py::test_plot_parallel[minmax] arviz/tests/test_plots.py::test_plot_parallel[rank] arviz/tests/test_plots.py::test_plot_parallel_exception[None] arviz/tests/test_plots.py::test_plot_parallel_exception[mu] arviz/tests/test_plots.py::test_plot_parallel_exception[var_names2] arviz/tests/test_plots.py::test_plot_joint_bad arviz/tests/test_plots.py::test_plot_kde[kwargs0] arviz/tests/test_plots.py::test_plot_kde[kwargs1] arviz/tests/test_plots.py::test_plot_kde[kwargs2] arviz/tests/test_plots.py::test_plot_kde[kwargs3] arviz/tests/test_plots.py::test_plot_kde[kwargs4] arviz/tests/test_plots.py::test_plot_kde_cumulative[kwargs0] arviz/tests/test_plots.py::test_plot_kde_cumulative[kwargs1] arviz/tests/test_plots.py::test_plot_kde_cumulative[kwargs2] arviz/tests/test_plots.py::test_plot_kde_cumulative[kwargs3] arviz/tests/test_plots.py::test_plot_dist[kwargs1] arviz/tests/test_plots.py::test_plot_dist_2d_kde[kwargs0] arviz/tests/test_plots.py::test_plot_dist_2d_kde[kwargs1] arviz/tests/test_plots.py::test_plot_dist_2d_kde[kwargs2] arviz/tests/test_plots.py::test_plot_kde_quantiles[kwargs0] arviz/tests/test_plots.py::test_plot_kde_quantiles[kwargs1] arviz/tests/test_plots.py::test_plot_kde_quantiles[kwargs2] arviz/tests/test_plots.py::test_plot_kde_inference_data arviz/tests/test_plots.py::test_plot_khat arviz/tests/test_plots.py::test_plot_pair[kwargs2] arviz/tests/test_plots.py::test_plot_pair[kwargs3] arviz/tests/test_plots.py::test_plot_pair[kwargs4] arviz/tests/test_plots.py::test_plot_pair[kwargs5] arviz/tests/test_plots.py::test_plot_pair_2var[kwargs0] arviz/tests/test_plots.py::test_plot_pair_2var[kwargs1] arviz/tests/test_plots.py::test_plot_pair_2var[kwargs2] arviz/tests/test_plots.py::test_plot_pair_bad arviz/tests/test_plots.py::test_plot_pair_divergences_warning[True] arviz/tests/test_plots.py::test_plot_pair_divergences_warning[False] arviz/tests/test_plots.py::test_plot_ppc[False-None-density] arviz/tests/test_plots.py::test_plot_ppc[False-None-cumulative] arviz/tests/test_plots.py::test_plot_ppc[False-None-scatter] arviz/tests/test_plots.py::test_plot_ppc[False-0.2-density] arviz/tests/test_plots.py::test_plot_ppc[False-0.2-cumulative] arviz/tests/test_plots.py::test_plot_ppc[False-0.2-scatter] arviz/tests/test_plots.py::test_plot_ppc[False-1-density] arviz/tests/test_plots.py::test_plot_ppc[False-1-cumulative] arviz/tests/test_plots.py::test_plot_ppc[False-1-scatter] arviz/tests/test_plots.py::test_plot_ppc[True-None-density] arviz/tests/test_plots.py::test_plot_ppc[True-None-cumulative] arviz/tests/test_plots.py::test_plot_ppc[True-None-scatter] arviz/tests/test_plots.py::test_plot_ppc[True-0.2-density] arviz/tests/test_plots.py::test_plot_ppc[True-0.2-cumulative] arviz/tests/test_plots.py::test_plot_ppc[True-0.2-scatter] arviz/tests/test_plots.py::test_plot_ppc[True-1-density] arviz/tests/test_plots.py::test_plot_ppc[True-1-cumulative] arviz/tests/test_plots.py::test_plot_ppc[True-1-scatter] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-None-density] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-None-cumulative] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-None-scatter] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-0-density] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-0-cumulative] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-0-scatter] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-0.1-density] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-0.1-cumulative] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-0.1-scatter] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-1-density] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-1-cumulative] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-1-scatter] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-3-density] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-3-cumulative] arviz/tests/test_plots.py::test_plot_ppc_multichain[False-3-scatter] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-None-density] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-None-cumulative] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-None-scatter] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-0-density] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-0-cumulative] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-0-scatter] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-0.1-density] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-0.1-cumulative] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-0.1-scatter] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-1-density] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-1-cumulative] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-1-scatter] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-3-density] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-3-cumulative] arviz/tests/test_plots.py::test_plot_ppc_multichain[True-3-scatter] arviz/tests/test_plots.py::test_plot_ppc_discrete[False-density] arviz/tests/test_plots.py::test_plot_ppc_discrete[False-cumulative] arviz/tests/test_plots.py::test_plot_ppc_discrete[False-scatter] arviz/tests/test_plots.py::test_plot_ppc_discrete[True-density] arviz/tests/test_plots.py::test_plot_ppc_discrete[True-cumulative] arviz/tests/test_plots.py::test_plot_ppc_discrete[True-scatter] arviz/tests/test_plots.py::test_plot_ppc_grid arviz/tests/test_plots.py::test_plot_ppc_bad[density] arviz/tests/test_plots.py::test_plot_ppc_bad[cumulative] arviz/tests/test_plots.py::test_plot_ppc_bad[scatter] arviz/tests/test_plots.py::test_plot_violin[None] arviz/tests/test_plots.py::test_plot_violin[mu] arviz/tests/test_plots.py::test_plot_violin[var_names2] arviz/tests/test_plots.py::test_plot_violin_ax arviz/tests/test_plots.py::test_plot_violin_layout arviz/tests/test_plots.py::test_plot_autocorr_short_chain arviz/tests/test_plots.py::test_plot_autocorr_uncombined arviz/tests/test_plots.py::test_plot_autocorr_combined arviz/tests/test_plots.py::test_plot_autocorr_var_names[None] arviz/tests/test_plots.py::test_plot_autocorr_var_names[mu] arviz/tests/test_plots.py::test_plot_autocorr_var_names[var_names2] arviz/tests/test_plots.py::test_plot_rank[kwargs0] arviz/tests/test_plots.py::test_plot_rank[kwargs1] arviz/tests/test_plots.py::test_plot_rank[kwargs2] arviz/tests/test_plots.py::test_plot_rank[kwargs3] arviz/tests/test_plots.py::test_plot_rank[kwargs4] arviz/tests/test_plots.py::test_plot_posterior[kwargs0] arviz/tests/test_plots.py::test_plot_posterior[kwargs1] arviz/tests/test_plots.py::test_plot_posterior[kwargs2] arviz/tests/test_plots.py::test_plot_posterior[kwargs3] 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arviz/tests/test_stats_utils.py::test_wrap_ufunc_output[True-quantile1] arviz/tests/test_stats_utils.py::test_wrap_ufunc_output[False-quantile0] arviz/tests/test_stats_utils.py::test_wrap_ufunc_output[False-quantile1] arviz/tests/test_stats_utils.py::test_make_ufunc[1] arviz/tests/test_stats_utils.py::test_make_ufunc[2] arviz/tests/test_stats_utils.py::test_make_ufunc[3] arviz/tests/test_stats_utils.py::test_make_ufunc_out[1] arviz/tests/test_stats_utils.py::test_make_ufunc_out[2] arviz/tests/test_stats_utils.py::test_make_ufunc_out[3] arviz/tests/test_stats_utils.py::test_make_ufunc_bad_ndim arviz/tests/test_stats_utils.py::test_make_ufunc_out_bad[1] arviz/tests/test_stats_utils.py::test_make_ufunc_out_bad[2] arviz/tests/test_stats_utils.py::test_make_ufunc_out_bad[3] arviz/tests/test_stats_utils.py::test_nan[all] arviz/tests/test_stats_utils.py::test_nan[any] arviz/tests/test_stats_utils.py::test_nan_axis[-1] arviz/tests/test_stats_utils.py::test_nan_axis[0] arviz/tests/test_stats_utils.py::test_nan_axis[1] arviz/tests/test_stats_utils.py::test_valid_shape arviz/tests/test_stats_utils.py::test_elpd_data_error
arviz/tests/test_plots.py::test_plot_trace_discrete arviz/tests/test_plots.py::test_plot_joint[scatter] arviz/tests/test_plots.py::test_plot_joint[hexbin] arviz/tests/test_plots.py::test_plot_joint[kde] arviz/tests/test_plots.py::test_plot_joint_discrete arviz/tests/test_plots.py::test_plot_dist[kwargs0] arviz/tests/test_plots.py::test_plot_pair[kwargs0] arviz/tests/test_plots.py::test_plot_pair[kwargs1] arviz/tests/test_plots.py::test_plot_ppc_save_animation[density] arviz/tests/test_plots.py::test_plot_ppc_save_animation[cumulative] arviz/tests/test_plots.py::test_plot_ppc_save_animation[scatter] arviz/tests/test_plots.py::test_plot_ppc_discrete_save_animation[density] arviz/tests/test_plots.py::test_plot_ppc_discrete_save_animation[cumulative] arviz/tests/test_plots.py::test_plot_ppc_discrete_save_animation[scatter] arviz/tests/test_plots.py::test_non_linux_blit[Windows] arviz/tests/test_plots.py::test_non_linux_blit[Darwin] arviz/tests/test_plots.py::test_plot_violin_discrete
arviz/plots/elpdplot.py arviz/plots/__init__.py doc/logo/generate_logo.py arviz/plots/plot_utils.py arviz/stats/stats_utils.py arviz/stats/__init__.py arviz/stats/stats.py doc/api.rst
arviz/plots/elpdplot.py arviz/plots/__init__.py doc/logo/generate_logo.py arviz/plots/plot_utils.py arviz/stats/stats_utils.py arviz/stats/__init__.py arviz/stats/stats.py doc/api.rst