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Re: st: trend test of OR in matched case control studies


From   Joseph Coveney <jcoveney@bigplanet.com>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   Re: st: trend test of OR in matched case control studies
Date   Tue, 25 Nov 2003 11:17:19 +0900

Sanny Chen wrote:

> Hi,
>
> How do I perform a trend test of OR in a matched case control study?
>
> For an unmatched study, TABODDS does the trend test, but what is the 
> equivalent command for a matched case control study?
>
> Thanks in advance,
>
> Sanny

Wouldn't -symmetry , trend- do what you want?  

Otherwise, you could set up the linear component of an orthogonal polynomial 
contrast for the predictor using -desmat- and then use -clogit-/-xtlogit-:

char predictor[pzat] orp(1)
desmat: xtlogit response predictor, i(clusterID)

Joseph Coveney


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