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st: Re: Poolability tests and count data


From   "Scott Merryman" <smerryman@kc.rr.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: Poolability tests and count data
Date   Fri, 18 Oct 2002 11:23:52 -0500

Both xtpois and xtnbreg provide a likelihood ratio test of the panel estimator
with the pooled estimator.

Scott

----- Original Message -----
From: <bw0003@uni-essen.de>
To: <statalist@hsphsun2.harvard.edu>
Sent: Thursday, October 17, 2002 9:17 AM
Subject: st: Poolability tests and count data


> Hallo,
>
> i am going to work with a panel (300 firms, information from 18 years each)
and want to know if i "can" pool the data or if i have to use panel-methods. The
well known tests like the LR- or Breusch-Pagan-Test are always used with
non-discrete data but not with count data. My dataset contains count data and i
want to know if i should use the NEGBIN-modell or the random or fixed
effect-panel modell with count data. Which test do i have to make and how can i
perform it with STATA?
>
> Yours sincerly,
> Jörg
>



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