def group_barh(self, column_label, **vargs):
        """Plot a horizontal bar chart for the table.

        The values of the specified column are grouped and counted, and one
        bar is produced for each group.

        Note: This differs from ``barh`` in that there is no need to specify
        bar heights; the size of a category's bar is the number of copies
        of that category in the given column.  This method behaves more like
        ``hist`` in that regard, while ``barh`` behaves more like ``plot`` or
        ``scatter`` (which require the second coordinate of each point to be
        specified in another column).

        Args:
            ``column_label`` (str or int): The name or index of a column

        Kwargs:
            overlay (bool): create a chart with one color per data column;
                if False, each will be displayed separately.

            width (float): The width of the plot, in inches
            height (float): The height of the plot, in inches

            vargs: Additional arguments that get passed into `plt.bar`.
                See http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.bar
                for additional arguments that can be passed into vargs.
        """
        self.group(column_label).barh(column_label, **vargs)