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Re: st: How to test the significance of a ratio of two correlated odds ratios in Stata


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to test the significance of a ratio of two correlated odds ratios in Stata
Date   Mon, 5 Sep 2011 09:59:50 +0200

On Mon, Sep 5, 2011 at 9:50 AM, Maarten Buis wrote:
> I would do this by creating my own dummy variables. Lets say that 0 is
> a placebo, and 1 and 2 are different treatments. I would create one
> dummy that is 0 when placebo and 1 when any treatment and one dummy
> that is 0 when placebo or treatment 1 and is 1 when treatment 2. If
> you add those two dummies to your model than the "odds ratio" reported
> by -logit- is actually the ratio of odds ratios you are looking for.

To be exact, the "odds ratio" belonging to the variable for
treatment_2. This is in effect an interaction term between treatment_2
and any_treatment.

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany


http://www.maartenbuis.nl
--------------------------
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