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2005 Nov 23
2
negative binomial overdispersion question
Hello,
I'm a grad student in the Intelligent Transportation Systems lab at Portland
State Univ. in Portland, OR, USA. I'm trying to learn the basics of R to run a
negative binomial in the near future, and so I ran a test regression on roadway
crash data obtained from "Statistical and Econometric Methods for
Transportation Data Analysis" by Washington et al (p. 250). I ran the test
(glm.nb from library MASS) and got the same output as in the text for all the
parameters except the overdispersion parameter; the text lists 0.516,...