I assume you mean that:
- a "time point" is a record
- each subject may have up to 28 time points (records)
- a variable - I'll call it ID - identifies the subject
- file is sorted by ID
AGGREGATE File=* /Break=ID
/MaxTime = MAX(TimePoint) .
(untested)
You can merge the aggregate results back with the original file
Dennis Deck, PhD
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