Plot the model fit (posterior predictive) of the existing products.
- Parameters:
 
- variable
str, optional The variable to compare. Either “mu” or “y”.
 
- plot_total_salesbool, optional
 Whether to plot the total sales or not.
 
- ax
plt.Axes, optional The matplotlib axes.
 
 
- Returns:
 
plt.AxesThe new or modified matplotlib axes.