Parameter (True Value) Group size End of Follow-up count data estimation method Likelihood Quasi-Likelihood Mean Std.Error Mean Std.Error θ1 50 -2.0984 1.1150 -2.1021 1.1078 (-2) 100 -2.0345 0.7781 -2.0375 0.7782 θ2 50 0.1040 0.2971 0.1024 0.2952 (0.1) 100 0.0978 0.2049 0.0986 0.2089 α 50 0.7148 0.2912 0.7189 0.2954 (0.7) 100 0.7058 0.2049 0.7059 0.2086 τ 50 1.4344 0.3556 1.4346 0.4243 (1.5) 100 1.4730 0.2489 1.4669 0.3144

Table 2: Simulation results for Estimation of φ Based on End-of-follow-up Count Data. The standard errors (Std.Err) have been calculated as the square roots of the simulated variances of the estimators.