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st: Negative Binomial Models


From   "MacDonald, John" <johnmac@rand.org>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Negative Binomial Models
Date   Wed, 13 Oct 2004 16:22:32 -0700

Is there a maximum number of counts one should not exceed when using the negative binomial model?  Even if there is a adjustment for exposure (e.g., rate of homicides in a city).  I have a data set with over 200 homicides in some cities and I saw a reference in an article of American Journal of Sociology to Maddala's 1977 econometrics textbook that said you should exceed 50 counts.  Is this true?



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