Some notes on unobserved parameters (frailties) in reliability modeling
- 주제(키워드) Frailty , Heterogeneous populations , Stress-strength model , Wiener process with drift , Inverse-Gaussian distribution
- 등재 SCIE, SCOPUS
- 발행기관 ELSEVIER SCI LTD
- 발행년도 2014
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000086874
- 본문언어 영어
- Published As http://dx.doi.org/10.1016/j.ress.2013.10.008
초록/요약
Unobserved random quantities (frailties) often appear in various reliability problems especially when dealing with the failure rates of items from heterogeneous populations. As the failure rate is a conditional characteristic, the distributions of these random quantities, similar to Bayesian approaches, are updated in accordance with the corresponding survival information. At some instances, apart from a statistical meaning, frailties can have also useful interpretations describing the underlying lifetime model. We discuss and clarify these issues in reliability context and present and analyze several meaningful examples. We consider the proportional hazards model with a random factor; the stress strength model, where the unobserved strength of a system can be viewed as frailty; a parallel system with a random number of components and, finally, the first passage time problem for the Wiener process with random parameters. (C) 2013 Elsevier Ltd. All rights reserved.
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