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Re: st: St: collapse by _N
From
Ulrich Kohler <[email protected]>
To
[email protected]
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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