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Re: st: keeping variables and subjects with specific observations
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: keeping variables and subjects with specific observations
Date
Fri, 18 Oct 2013 01:28:04 +0100
keep if Year == int_year
Nick
[email protected]
On 18 October 2013 01:07, Nicholas Winters
<[email protected]> wrote:
> 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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