RecursiveLSResults.plot_cusum(alpha=0.05, legend_loc='upper left', fig=None, figsize=None)[source]

Plot the CUSUM statistic and significance bounds.

  • alpha (float, optional) – The plotted significance bounds are 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).


Evidence of parameter instability may be found if the CUSUM statistic moves out of the significance bounds.


[*]Brown, R. L., J. Durbin, and J. M. Evans. 1975. “Techniques for Testing the Constancy of Regression Relationships over Time.” Journal of the Royal Statistical Society. Series B (Methodological) 37 (2): 149-92.