SeriesGroupBy.value_counts()
pandas.core.groupby.SeriesGroupBy.value_counts
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SeriesGroupBy.value_counts(normalize=False, sort=True, ascending=False, bins=None, dropna=True)
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© 2008–2014 the pandas development team
Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.core.groupby.SeriesGroupBy.value_counts.html