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...inomial(), aod::negbin() and gamlss::gamlss(). The gamlss function fits two different types of NB model, either family = NBI (quadratic; var = mu(1 + sigma * mu)) as I think for all the functions above, or family=NBII (linear; var = mu(1 + sigma)). Also note the somewhat special purpose function glmnb.fit() in the stat mod package, which requires preliminary setup steps. John Maindonald email: john.maindonald@anu.edu.au<mailto:john.maindonald@anu.edu.au> phone : +61 2 (6125)3473 fax : +61 2(6125)5549 Centre for Mathematics & Its Applications, Room 1194, John Dedman...