Negative Binomial Regression Models and Estimation …
where, exp 0 i is defined as a random intercept; 0 1 exp K iijj j x is the log-link between the Poisson mean and the covariates or independent variables xs; and s are the regression coefficients. As discussed in Appendix C, the relationship can also be formulated using vectors, such that exp(x'β) i i.
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