Accelerated Lifetime Data Analysis with a Nonconstant Shape Parameter

Table 5

Relative bias of .

Stress
level	RB1	RB2	RB3	RB1	RB2	RB3	RB1	RB2	RB3	RB1	RB2	RB3
1	0.02	13.12	14.07	0.01	8.58	9.25	0.01	6.63	7.18	0.01	1.69	1.96
2	0.18	26.92	26.07	0.01	17.27	16.86	0.01	13.25	13.01	0.01	3.36	3.52
3	0.48	43.06	41.99	0.03	27.08	26.57	0.03	20.60	20.31	0.01	5.17	5.34
4	0.41	20.16	21.30	0.03	13.04	13.81	0.03	10.03	10.65	0.01	2.53	2.79
5	0.17	35.59	35.27	0.01	22.56	22.26	0.01	17.21	16.92	0.01	4.29	4.03
6	0.32	17.32	17.71	0.03	11.40	11.67	0.02	8.88	9.11	0.02	2.55	2.67
7	0.14	16.27	16.38	0.01	10.66	10.73	0.01	8.27	8.32	0.00	2.26	2.26

RB₁, RB₂, and RB₃ are relative biases of the proposed method, GLM method, and EM method (in %), respectively.