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NOTE!! - when I initially posted this I was incorrect, I thought SPSS listed the dispersion term in the form of Var(x) = mean + mean*dispersion . But I was wrong, and it is Var(x) = 1 + mean*dispersion (the same as Stata's, what Cameron and Trivedi call the NB2 model, as cited in the Long and...
For my dissertation I have been estimating negative binomial regression models predicting the counts of crimes at small places (i.e. street segments and intersections). When evaluating the fit of poisson regression models and their variants, you typically make a line plot of the observed percent...
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