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| time_deltas = appt_data['AppointmentDay'] - appt_data['ScheduledDay'] | |
| appt_data['WaitingTime'] = time_deltas.copy() | |
| appt_data['WaitingTime'] = appt_data['WaitingTime'].dt.days | |
| # Interestingly, about 1/3 of appointments were booked AFTER they happened... | |
| appt_data['WaitingTime'].where( | |
| appt_data['WaitingTime'] < pd.Timedelta(0)).count() / appt_data['WaitingTime'].count() | |
| # 0.34894641128412063 |
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