variables : int or str or iterable of int or string, optional
Integer index or string name of the variable whose coefficient will
be plotted. Can also be an iterable of integers or strings. Default
is the first variable.
alpha : float, optional
The confidence intervals for the coefficient are (1 - alpha) %
legend_loc : string, optional
The location of the legend in the plot. Default is upper left.
fig : Matplotlib Figure instance, optional
If given, subplots are created in this figure instead of in a new
figure. Note that the grid will be created in the provided
figure using fig.add_subplot().
figsize : tuple, optional
If a figure is created, this argument allows specifying a size.
The tuple is (width, height).
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