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st: nbvargr for count data


From   Laurie Molina <molinalaurie@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: nbvargr for count data
Date   Thu, 14 Oct 2010 10:42:39 -0500

Dear statalist,

I am using the command nbvargr (Philip B. Ender UCLA, Office of
Academic Computing) as in
(http://www.ats.ucla.edu/stat/stata/library/count.htm ). It graphs the
distribution of the count data in a data set with the correspondig
negative binomial distribution and poisson distribution (with the
parameters resulting from the data set) to see which distribution fits
the data better.

My question is : Why is it useful to do such comparision if the
relevant distribution to get efficient estimators  when running a
poisson or negative binomial regression is the conditional
distribution and not the univariate distribution of the dependent
variable ?

Thank you all as always!

LM
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