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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