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st: Use of offset variables with discrete-choice models

From   James Shaw <[email protected]>
To   [email protected]
Subject   st: Use of offset variables with discrete-choice models
Date   Wed, 19 Jan 2005 07:26:18 -0800 (PST)

Dear all,

I understand why one might wish to use an offset when
estimating a Poisson regression (i.e., to model rates
as opposed to counts).  However, can anyone tell me
why one would use an offset when fitting a logistic or
complementary log-log model?  Particularly in the
context of longitudinal (panel) data?  I have gone
through all of the Stata reference manuals I own
(which, unfortunately, do not include the User's
manual) and have also tried to find the answer online.
 Any feedback would be appreciated.



James W. Shaw, Ph.D., Pharm.D., M.P.H.
Post-Doctoral Fellow
Tobacco Control Research Branch
Behavioral Research Program
Division of Cancer Control and Population Sciences
National Cancer Institute
Tel.:  215-852-3045
Fax:  215-542-7150

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