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st: Missing Log-Likelihood test of alpha in nbreg
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.
Robert J. Fornango
University of Missouri-St. Louis
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