statsmodels.genmod.generalized_estimating_equations.GEEResults.plot_isotropic_dependence

GEEResults.plot_isotropic_dependence(ax=None, xpoints=10, min_n=50)

Create a plot of the pairwise products of within-group residuals against the corresponding time differences. This plot can be used to assess the possible form of an isotropic covariance structure.

Parameters:

• ax (Matplotlib axes instance) – An axes on which to draw the graph. If None, new figure and axes objects are created
• xpoints (scalar or array-like) – If scalar, the number of points equally spaced points on the time difference axis used to define bins for calculating local means. If an array, the specific points that define the bins.
• min_n (integer) – The minimum sample size in a bin for the mean residual product to be included on the plot.