In [1]: df = pd.DataFrame({'a': [1, 2, 2, 2, 2, np.nan],'b': [3, 3, 4, 4, 4, 4]})
In [2]: pd.crosstab(df.a, df.b, margins=True, dropna=True)
Out[2]:
b 3 4 All
a
1.0 1 0 1
2.0 1 3 4
All 2 3 5
In [3]: pd.crosstab(df.a, df.b, margins=True, dropna=False)
KeyError: 'Level None not found'
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