How to make a pandas crosstab with percentages?

Question

Given a dataframe with different categorical variables, how do I return a cross-tabulation with percentages instead of frequencies?

df = pd.DataFrame({\'A\' : [\         


        

Answer 1

If you're looking for a percentage of the total, you can divide by the len of the df instead of the row sum:

pd.crosstab(df.A, df.B).apply(lambda r: r/len(df), axis=1)