Added missing comma to Regression.rst
@@ -243,7 +243,7 @@ The :meth:`~lifelines.fitters.coxph_fitter.CoxPHFitter.plot_covariate_groups` me
cph.plot_covariate_groups(
['d1', 'd2' 'd3', 'd4', 'd5'],
- np.eye(5)
+ np.eye(5),
cmap='coolwarm')
The reason why we use ``np.eye`` is because we want each row of the matrix to "turn on" one category and "turn off" the others.
