I would like to count the number of subsequent appointments that occur for a client within 4 time periods from an initial appointment date: within 90 days, between 91-180 days, 181-270 days, and 271-365 days.
Column A is client number
Column B is initial (appointment) date
Column C-F are appt 1 date, appt 2 date, appt 3 date, appt 4 date
I have attached a sample of what I'm trying to do. Suggestions?
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