In Modeling Count Data; Cambridge University Press: Cambridge, UK, 2014; pp. 126–161. [Google Scholar] Yirga, A.A.; Melesse, S.F.; Mwambi, H.G.; Ayele, D.G. Negative binomial mixed models for analyzing longitudinal CD4 count data. Sci. Rep. 2020, 10, 16742. [Google Scholar]...