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Re: st: trend analysis for survey data


From   Steven Samuels <samplerx@earthlink.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: trend analysis for survey data
Date   Mon, 10 Mar 2008 12:30:39 -0400

-svyset- your data. Then try -svy reg- for your 0-1 outcome on the  
time dimension variable.  If the prevalences are close to zero or  
one, you could consider -svy logit -.  From your question, I take it  
that the surveys are independent, but taken over the time dimension  
and that the target populations were identical, except for time  
period.  You will need to define new strata, which are combinations  
of survey and the original strata.

This assumes that primary sampling units were newly sampled for each  
survey. If not, you cannot treat the surveys as independent and  
should come back here for help.

-Steven
On Mar 10, 2008, at 4:28 AM, audreyp@neo013.net wrote:

> hi,
> I have data on three/four independent cross-sectional surveys (not  
> panels). I need to test for a trend in the prevalence of a health  
> condition. How can I do a trend analysis in Stata that will take  
> into account sampling weights and stratification?
> thank you.
>
> Audrey P.
>
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Steven Samuels
845-246-0774
18 Cantine's Island
Saugerties, NY 12477
EFax: 208-498-7441





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