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Re: st: Pseudo R2 in poisson regression

From   Richard Williams <>
Subject   Re: st: Pseudo R2 in poisson regression
Date   Thu, 04 Aug 2005 15:34:04 -0500

At 03:05 PM 8/4/2005 -0400, Raymond wrote:
the command I'm using is:
xi:poisson death i.age i.cohort i.period, exposure(population) constraints (1)
I believe the constraint is what is zapping you. You should notice that you are also getting a Wald chi-square instead of an LR chi-square. (Perhaps exposure zaps you too, but constraint definitely does.)

You could probably calculate by hand. Alternatively, what is the constraint? You might be able to specify the constraint some other way, e.g. add 2 vars together so their estimated effects are equal.

Richard Williams, Notre Dame Dept of Sociology
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