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raw_existing_df[raw_existing_df.date >= '2023-04-02']\ .groupby('user_id', as_index = False).date.min()\ .groupby('date', as_index = False).user_id.count()\ .rename(columns = {'user_id': 'existing_users'}) We got the first estimations. If we had launched this test in April 2023, we would have