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st: control selection - looping over observations not possible - alternatives
From
raoul reulen <[email protected]>
To
[email protected]
Subject
st: control selection - looping over observations not possible - alternatives
Date
Tue, 26 Jan 2010 14:59:17 +0000
Dear Statalisters
I need to select up to 20 controls for each of 10,000 subjects from a
dataset of around half-a-million subjects. The controls need to
satisfy certain criteria (e.g., same age). How can I do this without
having to loop over observations? Thanks.
Raoul
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