Table 3.

Power under the Cox proportional hazards model (19).

	Group Scheme 1		Group Scheme 2		Random		K-means	Cox Model
β parameter	Stat 1	Stat 2	Stat 1	Stat 2	Stat 1	Stat 2	Stat 3	Wald
βage = −0.05	0.995	1	1	1	0.999	1	1	1
βage = −0.034	0.765	0.982	0.99	1	0.877	0.994	0.995	0.95
βage = −0.018	0.273	0.509	0.614	0.789	0.389	0.632	0.65	0.488
βage = −0.002	0.07	0.096	0.14	0.164	0.116	0.16	0.118	0.062
βage = 0	0.055	0.052	0.066	0.056	0.059	0.069	0.043	0.072
βage = 0.014	0.057	0.09	0.063	0.098	0.042	0.049	0.106	0.501
βage = 0.03	0.232	0.383	0.369	0.52	0.147	0.25	0.534	0.942
βage = 0.046	0.488	0.786	0.699	0.915	0.393	0.628	0.913	0.999
βage = 0.062	0.731	0.927	0.905	0.989	0.613	0.867	0.988	1
βage = 0.078	0.847	0.985	0.976	1	0.781	0.957	1	1
βage = 0.094	0.927	0.998	0.992	1	0.885	0.989	1	1