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Re: st: trend analysis for survey data


From   Mohammed El Faramawi <melfaram@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: trend analysis for survey data
Date   Mon, 10 Mar 2008 11:35:48 -0700 (PDT)

Hi steven,
It seems that I am missing something. Why do you
recommend using svy:regress with a categorical
variable?? why not svy:logit from the beginning?
thank oyu 
--- Steven Samuels <samplerx@earthlink.net> wrote:

> -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.
> >
> > *
> > *   For searches and help try:
> > *  
> http://www.stata.com/support/faqs/res/findit.html
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
> 
> Steven Samuels
> 845-246-0774
> 18 Cantine's Island
> Saugerties, NY 12477
> EFax: 208-498-7441
> 
> 
> 
> 
> 
> *
> *   For searches and help try:
> *  
> http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
> 



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