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Re: st: Keep specific observation
From
Nick Cox <njcoxstata@gmail.com>
To
statalist@hsphsun2.harvard.edu
Subject
Re: st: Keep specific observation
Date
Fri, 2 Sep 2011 15:17:07 +0100
bysort col1 (col2) : keep if col2 == _n & _N == 3
Nick
On Fri, Sep 2, 2011 at 3:12 PM, Yun <yuniphone@yahoo.co.id> wrote:
> I need help in stata command to drop/keep certain observations using stata 11.0
>
>
> There are two column of different data. Fisrt column is A,B,C (unique ID). The second column has data 1,2,3.
>
> Column 1 Column2
> A 1
> A 2
> A 3
> B 1
> B 2
> C 1
> C 2
> C 3
> D 1
> D 3
>
>
> I need all the observations that satisfy this condition --> column 1 will have group of column 2 (1,2,3)--> for instance A & C.
>
> I do not know the command for this.
>
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