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st: question for listserve


From   scho0600@umn.edu
To   statalist@hsphsun2.harvard.edu
Subject   st: question for listserve
Date   12 Jun 2009 07:43:58 -0500

I am trying to determine the statistical significance of the change in a parameter estimate for a predictor variable in a logistic regression when another predictor is added In other words, I have two models;

model 1: logit y on z x1 x2

model 2: logit y on z x1 x2 x3. I want to check if the association between y and z is mediated in part by x3. I have already determined that z is associated with x3 and that y is associated with x3.

I have tried to do this with the suest command but I do not trust the results since the two regressions are not run on independent samples.

I would be grateful for any guidance from anyone on how to perform a valid statistical test the change in the parameter estimate for z when x3 is added to the regression.

John T. Schousboe
University of Minnesota
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