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st: Negative Binomial mean and variance


From   "Carter Ivan Rees" <CRees1@uwyo.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Negative Binomial mean and variance
Date   Wed, 6 Apr 2005 15:55:53 -0600

Statalisters,

Is there a hard and fast rule as to how small your mean and variance
need to be when modeling count data via negative binomial regression?  I
know about the assumption of overdispersion but have never seen anything
on the relative "size" of these two measures.  I am assuming that the
larger the mean the more your model looks like a normal distribution...

Thanks in advance!

Carter Rees



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