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BUG: Crosstab margins ignoring dropna #12614

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BUG: Crosstab margins ignoring dropna #12614

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9c0d99b
Modified _generate_marginal_results
OXPHOS Mar 14, 2016
7c28949
change in pivot_table-if margin
Mar 14, 2016
0039da5
Documentaion
Mar 14, 2016
76fbacf
Fix stylistic errors
OXPHOS Mar 15, 2016
869a253
Fixed margin=true, dropna=false error
OXPHOS Mar 16, 2016
d3ed27a
Update what's new
OXPHOS Mar 16, 2016
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v0.18.1.txt
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Expand Up @@ -89,3 +89,4 @@ Bug Fixes
~~~~~~~~~

- Bug in ``value_counts`` when ``normalize=True`` and ``dropna=True`` where nulls still contributed to the normalized count (:issue:`12558`)
- Bug in ``pivot_table`` when ``margins=True`` and ``dropna=True`` where nulls still contributed to margin count (:issue:`12577`)
2 changes: 2 additions & 0 deletions pandas/tools/pivot.py
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Expand Up @@ -149,6 +149,8 @@ def pivot_table(data, values=None, index=None, columns=None, aggfunc='mean',
table = table.fillna(value=fill_value, downcast='infer')

if margins:
if dropna:
data = data[data.notnull().all(axis=1)]
table = _add_margins(table, data, values, rows=index,
cols=columns, aggfunc=aggfunc,
margins_name=margins_name)
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29 changes: 29 additions & 0 deletions pandas/tools/tests/test_pivot.py
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Expand Up @@ -936,6 +936,35 @@ def test_crosstab_no_overlap(self):

tm.assert_frame_equal(actual, expected)

def test_margin_ignore_dropna_bug(self):
# GH 12577
# pivot_table counts null into margin ('All')
# when margins=true and dropna=true

df = pd.DataFrame({'a': [1, 2, 2, 2, 2, np.nan],
'b': [3, 3, 4, 4, 4, 4]})
actual = pd.crosstab(df.a, df.b, margins=True)
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explictly add dropna=True for these. tests

then add a test for dropna=False (same set of tests)
and you will find it raises. the level is None fails.

In [10]: pd.crosstab(df.a,df.b,margins=True,dropna=False)
KeyError: 'Level None not found'

expected = pd.DataFrame([[1, 0, 1], [1, 3, 4], [2, 3, 5]])
expected.index = Index([1.0, 2.0, 'All'], name='a')
expected.columns = Index([3, 4, 'All'], name='b')
tm.assert_frame_equal(actual, expected)

df = DataFrame({'a': [1, np.nan, np.nan, np.nan, 2, np.nan],
'b': [3, np.nan, 4, 4, 4, 4]})
actual = pd.crosstab(df.a, df.b, margins=True)
expected = pd.DataFrame([[1, 0, 1], [0, 1, 1], [1, 1, 2]])
expected.index = Index([1.0, 2.0, 'All'], name='a')
expected.columns = Index([3.0, 4.0, 'All'], name='b')
tm.assert_frame_equal(actual, expected)

df = DataFrame({'a': [1, np.nan, np.nan, np.nan, np.nan, 2],
'b': [3, 3, 4, 4, 4, 4]})
actual = pd.crosstab(df.a, df.b, margins=True)
expected = pd.DataFrame([[1, 0, 1], [0, 1, 1], [1, 1, 2]])
expected.index = Index([1.0, 2.0, 'All'], name='a')
expected.columns = Index([3, 4, 'All'], name='b')
tm.assert_frame_equal(actual, expected)

if __name__ == '__main__':
import nose
nose.runmodule(argv=[__file__, '-vvs', '-x', '--pdb', '--pdb-failure'],
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