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st: Identifying visits with 1 time period of an event


From   "Paul O'Brien" <paul.obrien@afe2.org.uk>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: Identifying visits with 1 time period of an event
Date   Mon, 17 Feb 2014 20:23:21 +0000

I have longitudinal data on visits to a clinic during which a procedure sometimes occurs.

I want to mark follow-up visits if the procedure occurred and mark the visits within 1 time period of the procedure, as in the last two variables here.

clear
input ///
id           time      procedure      followup      followup1
1                1             0             0             0
1                2             1             0             0
1                3             0             1             1
1                4             0             2             0
1                5             0             3             0
2                3             1             0             0
2                4             0             1             1
2                5             0             2             0
2                7             0             3             0
2                8             0             4             0
2                10            0             5             0
3                1             0             0             0
3                2             0             0             0
3                3             0             0             0
3                4             0             0             0
4                2             0             0             0
4                3             1             0             0
4                6             0             1             0
4                7             0             2             0
end

I have struggled with _n and _N but cannot get the follow to start after the event.

Thanks,

Paul



-------------------------------
Dr Paul O'Brien
Raymede Clinic
Westside Contraception and Sexual Health Services
Central London Community Healthcare
Exmoor St
London
W10 6DZ
UK
+44 (0)20 8962 5511












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