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Re: st: Cochran-Armitage test for trend


From   Joseph Coveney <jcoveney@bigplanet.com>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Cochran-Armitage test for trend
Date   Sat, 29 Mar 2003 13:00:36 +0900

Mary Vaughan posted, "Can somebody tell me how to calculate a Cochran-Armitage 
test for trend using STATA?  I don't see it referenced anywhere in the manuals."

Yes.  Take a look at the FAQ, "Does Stata provide a test for trend?" on StataCorp's 
website:  http://www.stata.com/support/faqs/stat/trend.html

Quoting from it, "Qdeparture (=`Chi2(1) for departure1 as [Patrick] Royston's [-ptrend- 
command's] output nicely labels it) is the statistic for the Cochran-Armitage test. But 
Qtrend and Qdeparture are usually performed at the same time, so lumping them 
together under the name 'Cochran-Armitage' is sometimes loosely done."

-findit ptrend- will help you download Patrick' command if you don't have it installed 
already.

Joseph Coveney


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