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YoYs active_forecast_df['active_user_prev_year'] = active_forecast_df.active_users.shift(52) active_forecast_df['yoy'] = active_forecast_df.active_users_model/\ active_forecast_df.active_user_prev_year existing_model_df = existing_model_df.rename( columns = {'date': 'model_date', 'existing_users':