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st: Missing Log-Likelihood test of alpha in nbreg


From   rjf0ac@studentmail.umsl.edu
To   statalist@hsphsun2.harvard.edu
Subject   st: Missing Log-Likelihood test of alpha in nbreg
Date   Sun, 16 Feb 2003 01:54:00 -0600 (CST)

Hello all:

I am running some negative binomial poisson models, but Stata is not providing 
me with the log-likelihood ratio test of alpha. Other analysis of the data, 
including poisson models, suggests there is overdispersion. It is possible that 
a zero-inflated negative binomial model might be more appropriate. However, I 
would imagine that this would not prevent Stata from calculating the alpha test.

I am using Intercooled Stata 6.0, and the models do include pweights and 
clustering. If anyone might know why I cannot get the alpha test in my output, 
I would greatly appreciate the assistance. I am a relative novice to Stata, but 
the manuals and online help have not provided an answer for this situation.

Thanks,
Robert J. Fornango
University of Missouri-St. Louis
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