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Decline and repair, and covariate effects

Wu, Shaomin and Scarf, Philip 2015. Decline and repair, and covariate effects. European Journal of Operational Research 244 (1) , pp. 219-226. 10.1016/j.ejor.2015.01.041

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The failure processes of repairable systems may be impacted by operational and environmental stress factors. To accommodate such factors, reliability can be modelled using a multiplicative intensity function. In the proportional intensity model, the failure intensity is the product of the failure intensity function of the baseline system that quantifies intrinsic factors and a function of covariates that quantify extrinsic factors. The existing literature has extensively studied the failure processes of repairable systems using general repair concepts such as age-reduction when no covariate effects are considered. This paper investigates different approaches for modelling the failure and repair process of repairable systems in the presence of time-dependent covariates. We derive probabilistic properties of the failure processes for such systems.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Business (Including Economics)
Publisher: Elsevier
ISSN: 0377-2217
Date of First Compliant Deposit: 7 December 2020
Date of Acceptance: 20 January 2015
Last Modified: 09 Dec 2020 14:45

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