smith Jason , you can get a slightly more holistic view of number of exams taken by looking at the one way frequency of -max_exam-.
Result
Code:
tab max_exam if pick_id
Code:
. tab max_exam if pick_id
max_exam | Freq. Percent Cum.
------------+-----------------------------------
1 | 1 25.00 25.00
2 | 1 25.00 50.00
3 | 1 25.00 75.00
4 | 1 25.00 100.00
------------+-----------------------------------
Total | 4 100.00
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