def stats(self, variables=None, alpha=0.05, start=0,
              batches=100, chain=None, quantiles=(2.5, 25, 50, 75, 97.5)):
        """
        Statistical output for variables.

        :Parameters:
        variables : iterable
          List or array of variables for which statistics are to be
          generated. If it is not specified, all the tallied variables
          are summarized.

        alpha : float
          The alpha level for generating posterior intervals. Defaults to
          0.05.

        start : int
          The starting index from which to summarize (each) chain. Defaults
          to zero.

        batches : int
          Batch size for calculating standard deviation for non-independent
          samples. Defaults to 100.

        chain : int
          The index for which chain to summarize. Defaults to None (all
          chains).
        """

        # If no names provided, run them all
        if variables is None:
            variables = self._variables_to_tally
        else:
            variables = [v for v in self.variables if v.__name__ in variables]

        stat_dict = {}

        # Loop over nodes
        for variable in variables:
            # Plot object
            stat_dict[variable.__name__] = self.trace(
                variable.__name__).stats(alpha=alpha, start=start,
                                         batches=batches, chain=chain, quantiles=quantiles)

        return stat_dict
Statistical output for variables.

        :Parameters:
        variables : iterable
          List or array of variables for which statistics are to be
          generated. If it is not specified, all the tallied variables
          are summarized.

        alpha : float
          The alpha level for generating posterior intervals. Defaults to
          0.05.

        start : int
          The starting index from which to summarize (each) chain. Defaults
          to zero.

        batches : int
          Batch size for calculating standard deviation for non-independent
          samples. Defaults to 100.

        chain : int
          The index for which chain to summarize. Defaults to None (all
          chains).