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RE: st: panel data: drop a whole group/identifier


From   Sabrina Helmut <vitamint@hotmail.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: panel data: drop a whole group/identifier
Date   Wed, 17 Aug 2011 18:22:23 +0200

Thanks, Nick!

I ordered your paper but guess that the delivery will take some time. 

I learn from your command that isbad[_N] makes the difference....so just writing : bysort panelid (isbad) : drop if isbad==1 would drop only the observations per identifier where isbad is 1 and will keep the remaining years. By incoporating isbad[_N] stata understands that the whole identifier shall be dropped. Am I right?

----------------------------------------
> Date: Wed, 17 Aug 2011 16:03:17 +0100
> Subject: Re: st: panel data: drop a whole group/identifier
> From: njcoxstata@gmail.com
> To: statalist@hsphsun2.harvard.edu
>
> No; you can do this under the aegis of -by:- so long as you feed it
> the right information.
>
> gen isbad = year == 2006 & something_bad_is_true
> bysort panelid (isbad) : drop if isbad[_N]
>
> See also
>
> SJ-11-2 dm0055 . . . . . . . . . . . . . . Speaking Stata: Compared with ...
> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox
> Q2/11 SJ 11(2):305--314 (no commands)
> reviews techniques for relating values to values in other
> observations
>
> On Wed, Aug 17, 2011 at 3:54 PM, Sabrina Helmut <vitamint@hotmail.de> wrote:
>
> > I sorted my panel data by year (2004-2006) and identifier. Now, I want to drop the identifier for the whole panel (2004-2006) if a certain condition let's say for one of the years (2006) is not fulfilled. What is the correct command for dropping whole groups (characterised by a specific identifier)? I already tried the "by" command but think that this doesn't help to drop a whole group. "By" would only drop the year where the condition is not fulfilled and the remaining identifier-year observations are kept. Am I right?
>
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