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Re: st: St: collapse by _N


From   Ulrich Kohler <kohler@wzb.eu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: St: collapse by _N
Date   Wed, 20 Oct 2010 08:54:23 +0200

Am Mittwoch, den 20.10.2010, 02:35 -0400 schrieb Eric Uslaner:
> Greetings,
> 
> I have a survey data set with respondents geocoded.  I want to collapse the data set to the geocode level, so the simple command would be:
> 
> collapse varlist,by(geocode)
> 
> However some geocodes barely have any respondents and any collapsed data would be unreliable.  Is there a straightforward way to collapse only if the number of respondents is > 20 (e.g.)?
> 


. bysort geocode: gen n = _N
. collapse (mean) varlist if n >= 20, by(geocode)




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