Data Analysis of Step-Stress Accelerated Life Test with Random Group Effects under Weibull Distribution

Table 5

Predicted 90% percentile t_p (x₀) under use stress x₀ = 6.

	Group	Posterior mean	Posterior variance	2.5% quantile	Median	97.5% quantile	MC error
Prior 1	1	538.9	284.9^2	166.7	480.5	1252.0	3.009
	2	1031.0	549.7^2	321.5	914.2	2414.0	7.084
	3	829.7	439.0^2	258.1	738.8	1929.0	5.461
	4	2537.0	1527.0^2	710.7	2180.0	6450.6	26.11
	5	262.1	137.5^2	79.68	234.4	601.6	1.03
Prior 2	1	528.6	275.0^2	165.9	473.4	1214.0	3.287
	2	1000.0	529.0^2	316.8	888.7	2334.0	7.73
	3	850.5	421.1^2	255.7	716.9	1863.0	5.95
	4	2409.0	1422.0^2	683.3	2082.0	6048.0	29.3
	5	260.4	135.0^2	81.16	233.0	596.7	1.129
Prior 3	1	455.0	228.0^2	144.6	411.4	1015	3.231
	2	842.5	421.4^2	272.8	759.9	1879.0	6.965
	3	687.5	341.0^2	222.4	620.5	1528.0	5.214
	4	1929.0	1037.0^2	581.6	1712.0	4523.0	25.32
	5	228.4	113.8^2	72.42	207.2	509.3	1.21