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st: keeping variables and subjects with specific observations
From
Nicholas Winters <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: keeping variables and subjects with specific observations
Date
Fri, 18 Oct 2013 00:07:20 +0000
I have a data set with multiple entries per subject, I want to keep only the entries were two variables are equal (Year and int_year). So i want all entries for for all variables in my data set but only for when Year=int_year
data looks like this:
subject exposure Year int_year
1 3 1990 1991
1 4 1991 1991
1 3 1992 1991
1 4 1993 1991
2 3 1990 1990
2 5 1991 1990
3 3 1990 1990
3 4 1991 1992
3 3 1992 1992
Any ideas how?
Nick
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