Statistical Inference for Progressive Stress Accelerated Life Testing with Birnbaum-Saunders Distribution
Abstract
:1. Introduction
2. Progressive Stress Accelerated Life Testing
2.1. Step-Stress Test
2.2. Properties of GBS-II
3. Estimations
3.1. Likelihood-Based Method
3.2. Bayesian Inference
- Draw from in (26) using a Metropolis–Hastings (MH) procedure (see, for example, Chib and Greenberg [26]). We first propose , where the mean of the proposal is and is a tuning parameter to make the algorithm efficient, and then take with probability:
- Draw with updated and in (27).
- Draw from in (28) using an MH procedure. We propose from a lognormal distribution centered at the previous value, i.e., , where is a tuning parameter. For the purpose of sampling efficiency, we intend to specify a proposal distribution, which closely resembles the conditional posterior of . This consideration prompts us to specify the variance term , evaluated at updated values , as the reciprocal of Fisher information of the conditional posterior of , whose log-likelihood is . The Jacobian term is needed here as we make a log transformation on .
4. Simulation Study
5. Real Data Analysis
6. Conclusions Remarks
Funding
Conflicts of Interest
Appendix A
References
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n | ML Method | Bayesian | |||||||
---|---|---|---|---|---|---|---|---|---|
Bias | MSE | AL | CP (%) | Bias | MSE | AL | CP (%) | ||
20 | m | 0.1229 | 0.2861 | 1.2258 | 92.45 | 0.1166 | 0.1889 | 0.7493 | 93.11 |
0.1375 | 0.1578 | 0.4718 | 92.27 | 0.1302 | 0.1145 | 0.4523 | 93.19 | ||
0.0302 | 0.0736 | 0.2905 | 93.87 | 0.0216 | 0.0622 | 0.2322 | 94.69 | ||
30 | 0.1092 | 0.2363 | 1.1052 | 93.17 | 0.1007 | 0.1567 | 0.5329 | 94.82 | |
0.1236 | 0.1353 | 0.4546 | 93.21 | 0.1149 | 0.1072 | 0.4076 | 94.65 | ||
0.0244 | 0.0668 | 0.2118 | 94.29 | 0.0210 | 0.0516 | 0.1209 | 95.08 | ||
50 | 0.1035 | 0.1339 | 0.9777 | 94.43 | 0.0916 | 0.1113 | 0.2244 | 94.94 | |
0.1121 | 0.1151 | 0.4033 | 94.67 | 0.1108 | 0.0968 | 0.3323 | 95.15 | ||
−0.0112 | 0.0240 | 0.1352 | 95.15 | 0.0036 | 0.0116 | 0.1054 | 95.20 | ||
20 | m | 0.1104 | 0.1304 | 1.0141 | 93.27 | 0.1072 | 0.1184 | 0.7345 | 93.87 |
0.1229 | 0.1073 | 0.3694 | 93.51 | 0.1115 | 0.1016 | 0.3541 | 93.50 | ||
0.0314 | 0.0940 | 0.3181 | 93.85 | −0.0214 | 0.0720 | 0.2299 | 94.71 | ||
30 | 0.1051 | 0.1231 | 0.9386 | 94.52 | 0.1015 | 0.1125 | 0.5687 | 94.84 | |
0.1181 | 0.1063 | 0.3457 | 94.40 | 0.1047 | 0.0905 | 0.3186 | 94.77 | ||
0.0158 | 0.0674 | 0.2422 | 94.88 | 0.0083 | 0.0613 | 0.1646 | 95.14 | ||
50 | 0.0809 | 0.1150 | 0.5503 | 94.48 | 0.0202 | 0.0822 | 0.3789 | 95.18 | |
0.0492 | 0.0738 | 0.2128 | 94.53 | 0.0327 | 0.0578 | 0.1832 | 95.22 | ||
0.0080 | 0.0345 | 0.1957 | 95.12 | 0.0023 | 0.0207 | 0.0819 | 95.29 | ||
20 | m | 0.1792 | 0.1357 | 0.9778 | 91.94 | 0.1620 | 0.1212 | 0.7107 | 93.02 |
0.2242 | 0.2433 | 0.6218 | 92.19 | 0.2032 | 0.1493 | 0.4865 | 92.89 | ||
0.0371 | 0.1067 | 0.4728 | 93.56 | 0.0272 | 0.0831 | 0.2191 | 94.05 | ||
30 | 0.1628 | 0.1230 | 0.9018 | 93.52 | 0.1464 | 0.1108 | 0.6109 | 94.28 | |
0.1854 | 0.2038 | 0.5896 | 93.88 | 0.1494 | 0.1247 | 0.4033 | 94.29 | ||
−0.0232 | 0.0728 | 0.3480 | 94.26 | −0.0105 | 0.0624 | 0.1122 | 94.89 | ||
50 | 0.1155 | 0.1103 | 0.5135 | 93.49 | 0.0974 | 0.1042 | 0.4278 | 94.58 | |
0.1355 | 0.1665 | 0.4071 | 94.31 | 0.1134 | 0.1046 | 0.3083 | 94.82 | ||
0.0138 | 0.0416 | 0.2598 | 95.03 | 0.0094 | 0.0310 | 0.0844 | 95.26 | ||
20 | m | 0.2832 | 0.1303 | 0.9650 | 92.38 | 0.2176 | 0.1163 | 0.7058 | 93.41 |
0.3482 | 0.2777 | 0.8674 | 93.20 | 0.2887 | 0.2214 | 0.7195 | 93.14 | ||
−0.0526 | 0.1432 | 0.5216 | 93.92 | 0.0411 | 0.0933 | 0.2852 | 94.17 | ||
30 | 0.2583 | 0.1298 | 0.8960 | 93.35 | 0.1734 | 0.1091 | 0.6779 | 94.11 | |
0.3009 | 0.2356 | 0.7744 | 93.83 | −0.1939 | 0.2042 | 0.6438 | 94.71 | ||
−0.0423 | 0.1061 | 0.4238 | 94.33 | 0.0320 | 0.0720 | 0.1661 | 94.86 | ||
50 | 0.1598 | 0.1091 | 0.7047 | 94.38 | 0.1145 | 0.0928 | 0.5682 | 95.03 | |
−0.2064 | 0.1836 | 0.5209 | 94.73 | 0.1303 | 0.1555 | 0.4105 | 95.17 | ||
−0.0209 | 0.0674 | 0.2675 | 94.92 | 0.0106 | 0.0411 | 0.0784 | 95.30 |
3.4 | 3.4 | 3.4 | 3.5 | 3.5 | 3.5 | 3.6 | 3.8 | 3.8 | 3.8 | 3.8 | 3.9 | 3.9 | 3.9 | 4.0 |
4.0 | 4.0 | 4.0 | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.3 |
4.3 | 4.3 | 4.3 | 4.3 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.5 | 4.5 | 4.6 | 4.6 |
4.6 | 4.6 | 4.6 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.8 | 4.9 | 4.9 | 4.9 | 5.0 | 5.1 | 5.2 |
Method | m (95% CI) | (95% CI) | (95% CI) | , BIC |
---|---|---|---|---|
ML method | 4.9728 (2.0185, 12.2511) | 1.1686 (0.3807, 3.5874) | 4.2058 (3.7681, 4.7816) | 16.19, 125.81 |
Bayesian | 4.6523 (3.1521, 6.2339) | 1.2391 (0.9279, 2.3936) | 4.5614 (4.4250, 4.6945) | 8.82, 121.62 |
Method | m (95% CI) | (95% CI) | (95% CI) | , BIC |
---|---|---|---|---|
ML Method | 0.8326 (0.2170, 1.8444) | 1.6813 (0.3743, 7.5531) | 2.6093 (1.3854, 3.2163) | 97.30, 103.37 |
Bayesian | 0.4717 (0.3229, 0.6202) | 1.0291 (0.7826, 1.5031) | 1.7718 (1.0633, 2.9523) | 12.98, 92.36 |
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Sha, N. Statistical Inference for Progressive Stress Accelerated Life Testing with Birnbaum-Saunders Distribution. Stats 2018, 1, 189-203. https://doi.org/10.3390/stats1010014
Sha N. Statistical Inference for Progressive Stress Accelerated Life Testing with Birnbaum-Saunders Distribution. Stats. 2018; 1(1):189-203. https://doi.org/10.3390/stats1010014
Chicago/Turabian StyleSha, Naijun. 2018. "Statistical Inference for Progressive Stress Accelerated Life Testing with Birnbaum-Saunders Distribution" Stats 1, no. 1: 189-203. https://doi.org/10.3390/stats1010014