I'll have two computed fields, EVENT_A_TMPSTP and EVENT_B_TMSTP. I'll then find the minimum of each occurrence and move forward with those results. I'm not sure how the period will play into this next step...
I'm not sure how the blank will play into this next step. But it would be better, in my mind, to leave the missing there because for all arithmetic and functions and boolean comparisons, we know exactly how SAS will handle the missing value. You can use the MIN function, for example, and this will return the minimum of the non-missing values.
min(event_a_tmpstp,event_b_tmstp)
So, when you are finding the minimum, and one of the two values is missing, what do YOU want as the result?
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