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Re: st: Panel count data


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Panel count data
Date   Thu, 6 Sep 2012 18:16:27 +0100

-xtgee- seems nearer the mark for panel data.

I think you can only judge a fairly large incidence of zeros if a
Poisson family fails to account for them.

Nick

On Thu, Sep 6, 2012 at 6:07 PM, Alexander Bailey
<balcheeks@googlemail.com> wrote:
> I have panel count data, which i have being trying to model using the
> quasi-poisson model to correct for overdispersion.
>
>  glm stocklosses L.lynx L.feraldogs L.jackal L.ratelhoneybadger rain
> L.rain distance, family(poisson) link(log) scale (x2)
>
> Is this incorrect? If so what model should I use? If it is the correct
> approach how do I assess the fit of the model? Finally There is a
> fairly large incidents of zeros in my data, but stata does not allow
> me to use the zero-inflated commands with lagged explanatory variables
> which is crucial to my model.
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