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st: Proper use of Offset/Exposure in Poisson/Negbin


From   "Robert Kaminski" <KAMINSKI@OJP.USDOJ.GOV>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Proper use of Offset/Exposure in Poisson/Negbin
Date   Wed, 11 Dec 2002 13:05:20 -0500

I noticed a couple of papers recently where analysts specified a variable as 
an offset to control for unequal exposure, AND they included the same 
variable as a regressor in the same count model. The Stata manual provides an example of using an exposure variable as an offset and another example of including the variable on the right-hand side of the equation to control for 
unequal exposure, but there is no example of including an exposure variable 
both as an offset AND as a regressor on the right-hand side simultaneously. 

Any thoughts/comments on the appropriateness of this?

Thanks...

Bob Kaminski
Social Science Analyst
National Institute of Justice
Washington, DC
kaminski@ojp.usdoj.gov 
(202) 616-9135


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