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Table 2 Comparison of three models in terms of Log likelihood and AIC Statistic

From: Factors related to baseline CD4 cell counts in HIV/AIDS patients: comparison of poisson, generalized poisson and negative binomial regression models

Model Log likelihood AIC Statistic RMSE*
Generalized Poisson Regression − 30,508.67 13.86 1.052
Poisson Regression − 450,409.80 204.64 13.22
Negative Binomial Regression − 29,948.06 13.54 2.61
  1. RMSE: root mean square error