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st: trend in ORs across ordered levels of a 3rd variable


From   "Visintainer, Paul" <PAUL_VISINTAINER@NYMC.EDU>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: trend in ORs across ordered levels of a 3rd variable
Date   Fri, 18 Apr 2008 15:12:04 -0400

Is there an approach to analyzing the trend in odds ratios across the
ordered levels of a 3rd variable?  For example,

Suppose I have the risk of obesity in high school students by gender
over three different grades:

Grade		OR
10		1.5
11		1.9
12		2.2

There is a test of homogeneity to determine whether these ORs differ
across grade strata.  Is there a test to determine whether the pattern
is linear across strata?

Thanks,

-p

______________________________________
Paul F. Visintainer, PhD



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