Performs Negative-Binomial regression. Regression coefficients are updated using IRLS, and the dispersion parameter is estimated via Chi^2 dampening.
Hardin, J.W. and Hilbe, J.M. Generalized Linear Models and Extensions. 3rd Ed. p. 251-254.
for more information.
Updated file uploaded
May 22, 2013. Changed routine to estimate dispersion parameter using maximum likelihood. The entire Negative Binomial regression routine is now optimized via maximum likelihood.
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