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

["Visintainer, Paul" <PAUL_VISINTAINER@NYMC.EDU>]

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



*
*   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/