I-likelihood I-likelihood        
Models p (Null) (Full) AIC BIC R2 Concordance
Cox Proportional Hazard              
16 -622.0952 -489.9576 1011.915 1078.862 0.42 0.891
               
Semiparametric Gamma Frailty 19 -622.0952 -480.4515 998.903 1077.307 0.442 0.915
Where: P = Number of parameter estimated
Table 9: Log-Likelihood, AIC and BIC of Cox Proportional Hazard and Semiparametric Gamma Frailty Models.