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Re: st: IVPOIS question


From   Austin Nichols <austinnichols@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: IVPOIS question
Date   Wed, 6 Mar 2013 16:31:01 -0500

Anat (Manes) Tchetchik <anatmanes@gmail.com>:
No assumption about conditional variance is required for consistent
estimation of coefficients in a Poisson model or -glm- with a log
link. Only the conditional mean assumption is required.

The FAQ cited contains many errors--if anyone knows who wrote it,
please them know.

On Wed, Mar 6, 2013 at 4:01 PM, Anat (Manes) Tchetchik
<anatmanes@gmail.com> wrote:
> Dear all,
> I'm still struggling with my IV Poisson model.
> I'm not sure; does the assumption about conditional variance for
> consistency is required ?
> I read in http://www.ats.ucla.edu/stat/stata/dae/poissonreg.htm   that
> the Poisson has a strong assumption; that the conditional variance
> equals conditional mean
> If so then what test should be used to verify if my data is
> "qualified" for using this model?
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