#61 add line to Bayesian SC plot

Author: drbenvincent

causalpy/pymc_experiments.py

@@ -106,6 +106,7 @@ def plot(self):
 
         ax[2].set(title="Cumulative Causal Impact")
         plot_xY(self.datapost.index, self.post_impact_cumulative, ax=ax[2])
+        ax[2].axhline(y=0, c="k")
 
         # Intervention line
         for i in [0, 1, 2]: