Dear all,
If I have a database on STATA with multiple rows for each patient (due to multiple outpatient visits over time) how can I select just only the first row for each patient? I will past below an example of this database:
ID Patient sex age
101 0 65
101 0 65
101 0 65
102 1 59
102 1 59
102 1 59
0 Response to How to select a subset of data from a full database
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