period=None, demeaned=demeaned, group_adjust=group_adjust         )         pl.plt.show()         self.plot_cumulative_returns_by_quantile(period=None,                                                  demeaned=demeaned,                                                  group_adjust=group_adjust)         self.plot_top_down_cumulative_returns(period=None,                                               demeaned=demeaned,                                               group_adjust=group_adjust)         pl.plt.show()         self.plot_mean_quantile_returns_spread_time_series(             demeaned=demeaned, group_adjust=group_adjust         )         pl.plt.show()         if by_group:             self.plot_quantile_returns_bar(by_group=True,                                            demeaned=demeaned,                                            group_adjust=group_adjust)             pl.plt.show()          self.plot_quantile_returns_violin(demeaned=demeaned,                                           group_adjust=group_adjust)         pl.plt.show()      def create_