Re: st: Constraint, Poisson, & pseudo R^2

[David Jacobs <jacobs.184@sociology.osu.edu>]

That's almost certainly because Long and Freeze use their add on program 
that calculates psuedo R squares.  I can't remember the name of the add on 
program, but it is listed repeatedly in the Long and Freeze book.

Dave Jacobs
Ohio State

At 08:00 AM 10/19/2004 -0400, you wrote:

> In the Long & Freeze book published by  Stata, the authors estimate a Poisson
> regression model using the constraint  command to control for unequal
> exposure. It produces the same coefficients as  when using exposure or 
> offset, but
> the pseudo-R^2 value is substantially larger  when using the constraint 
> option
> (p. 265). However, when I use the constraint  option, Stata does not 
> produce a
> pseudo-R^2 value. Does anyone know whether  there has been a change made to
> the program by Stata?
>
> Thanks in  advance.
>
> Bob Kaminski
>
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