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st: Interpreting Poisson regression results with squared term


From   Antonio Silva <asilva100@live.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Interpreting Poisson regression results with squared term
Date   Wed, 13 Aug 2008 10:14:26 -0400


Hello All:

I recently posted a question on autocorrelation in Poisson regression, and I was very happy with the responses I received.

Now I have a question about interpreting my results.

I ran a Poisson regression in which # of groups founded per year was the dependent variable. My independent variables of interest are X1 and X1-squared. The results were as follows:

Independent Variables

Constant                       4.655

X1                               .5334**

X1-squared                  -.6439**

X2                               -1.176

X3                               -.0734

** p
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