34e7e918bd4fc09f643e8bb448e875a9bcb7e841,linearmodels/panel/data.py,PanelData,first_difference,#PanelData#,253

Before Change

        
        diffs = self._frame.diff(1).iloc[1:]
        elabels = self._frame.index.labels[0]
        same = elabels[1:] == elabels[:-1]
        diffs = diffs.loc[same]
        diffs = self._minimize_multiindex(diffs)
        return PanelData(diffs)

After Change

        diffs = pd.Panel(diffs, items=self.vars,
                         major_axis=self.time[1:],
                         minor_axis=self.entities)
        diffs = diffs.swapaxes(1, 2).to_frame(filter_observations=False)
        diffs = diffs.reindex(self._frame.index).dropna(how="any")
        return PanelData(diffs)

    @staticmethod
    def _minimize_multiindex(df):

Instances