Table I.

Simulation results for 7% censoring.

	β01	β02	β1	β2	β3	α1	α2	α3	γ
True parameter values	0.5	0.5	0.5	0.9	0.75	0.5	0.9	0.75	1
Semiparametric with n = 100
Mean			0.519	0.666	0.682	0.622	0.525	0.574	0.979
Bias			0.019	−0.234	−0.068	0.122	−0.375	−0.176	−0.021
Empirical SE			0.187	0.150	0.162	0.381	0.234	0.256	0.316
Bootstrap SE			0.152	0.151	0.164	0.289	0.210	0.226	0.411
95% CI coverage			0.938	0.928	0.959	0.851	0.877	0.892	0.995
Semiparametric with n = 200
Mean			0.524	0.730	0.694	0.650	0.609	0.595	1.007
Bias			0.024	−0.170	−0.056	0.150	−0.291	−0.155	0.007
Empirical SE			0.120	0.112	0.111	0.324	0.181	0.187	0.294
Bootstrap SE			0.106	0.119	0.118	0.231	0.171	0.176	0.276
95% CI coverage			0.915	0.969	0.964	0.906	0.924	0.942	0.920
Parametric with n = 100
Mean	0.511	0.504	0.502	0.910	0.830	0.496	0.900	0.872	1.014
Bias	0.011	0.004	0.002	0.010	0.080	−0.004	<0.001	0.122	0.014
Empirical SE	0.141	0.183	0.118	0.153	0.766	0.118	0.191	1.432	0.307
Model SE	0.141	0.182	0.114	0.134	0.192	0.123	0.168	0.267	0.297
95% CI coverage	0.952	0.948	0.956	0.919	0.956	0.960	0.927	0.980	0.948
Parametric with n = 200
Mean	0.499	0.513	0.490	0.897	0.772	0.498	0.886	0.770	1.005
Bias	−0.001	0.013	−0.010	−0.003	0.022	−0.002	−0.014	0.020	0.005
Empirical SE	0.097	0.141	0.081	0.085	0.132	0.091	0.117	0.178	0.214
Model SE	0.100	0.130	0.080	0.095	0.125	0.087	0.119	0.167	0.208
95% CI coverage	0.948	0.928	0.952	0.968	0.936	0.940	0.952	0.948	0.944
Parametric with n = 100; event time link misspecified
Mean	−0.650	0.504	0.435	0.899	0.986	0.421	0.875	1.033	1.039
Bias	−1.150	0.004	−0.065	−0.001	0.236	−0.079	−0.025	0.283	0.039
Empirical SE	0.260	0.191	0.211	0.137	1.300	0.284	0.272	1.644	0.397
Model SE	0.258	0.187	0.219	0.135	0.263	0.235	0.202	0.378	0.330
95% CI coverage	0.936	0.949	0.962	0.953	0.941	0.915	0.932	0.958	0.915
Parametric with n = 200; event time link misspecified
Mean	−0.639	0.506	0.416	0.889	1.036	0.422	0.858	1.230	0.973
Bias	−1.139	0.006	−0.084	−0.011	0.286	−0.078	−0.042	0.480	−0.027
Empirical SE	0.176	0.138	0.157	0.095	1.719	0.205	0.294	2.952	0.366
Model SE	0.181	0.133	0.154	0.095	0.186	0.169	0.146	0.258	0.225
95% CI coverage	0.958	0.946	0.942	0.954	0.729	0.929	0.888	0.504	0.921