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st: conflicting results on interaction effect


From   Meng Zhao <mrzm_www@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: conflicting results on interaction effect
Date   Wed, 21 Jul 2010 15:49:35 -0700 (PDT)

Hello,

I run a binomial logistic regression with an interaction variable:

     Coef.         P>z
x    6.958805      0.026
z    5.11967       0.000
x*z -7.490387      0.034

x is a continuous variable, z is a dummy variable. Does this result indicate a sig. positive relationship between x and dependent variable when z is 0, and a negative relationship between x and DV when z is 1? 

The plot of this interaction shows that there is a positive relationship between x and DV for both situations (z=1 & z=0). Why this conflicts with the above result?

Thanks.
Simon


      
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