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Re: st: svy subpop option and e(sample)


From   Richard Williams <richardwilliams.ndu@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: svy subpop option and e(sample)
Date   Wed, 25 May 2011 15:19:35 -0500

At 02:03 PM 5/25/2011, Steven Samuels wrote:
--

I have to agree with Stas. While the standard errors from subsetting and from using -subpop()- might be indistinguishable, it is not a given. My example was simplistic: there were no strata, and clusters were independent of the subpopulation, weight, and analysis variables.

Another, potentially more serious, problem for subpopulation analysis is not, I believe, mentioned in the SJ article: bias can arise if the supplied weights, appropriate for the whole sample, are wrong for the subpopulation. Levy & Lemeshow (2008, p.148) give a simple example.

Thanks to both you and Stas. Just so I am clear, would this be a problem even if using the subpop option, or only if using an extract?


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Richard Williams, Notre Dame Dept of Sociology
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