Panel.groupby()
pandas.Panel.groupby
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Panel.groupby(function, axis='major')
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Group data on given axis, returning GroupBy object
Parameters: function : callable
Mapping function for chosen access
axis : {‘major’, ‘minor’, ‘items’}, default ‘major’
Returns: grouped : PanelGroupBy
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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.Panel.groupby.html