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pandas.core.groupby.DataFrameGroupBy.shift
DataFrameGroupBy.shift(periods=1, freq=None, axis=0)
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Shift each group by periods observations
Parameters: periods : integer, default 1
number of periods to shift
freq : frequency string
axis : axis to shift, default 0
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https://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.core.groupby.DataFrameGroupBy.shift.html