Skip to main content

Decline and repair, and covariate effects

Wu, Shaomin, Scarf, Philip (2015) Decline and repair, and covariate effects. European Journal of Operational Research, 244 (1). pp. 219-226. ISSN 0377-2217. (doi:10.1016/j.ejor.2015.01.041) (KAR id:46766)

PDF Author's Accepted Manuscript
Language: English
Download (348kB) Preview
[thumbnail of Decline and repair, and covariate effects.pdf]
This file may not be suitable for users of assistive technology.
Request an accessible format
Official URL:


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 statistical properties of the failure processes for such systems.

Item Type: Article
DOI/Identification number: 10.1016/j.ejor.2015.01.041
Uncontrolled keywords: repair, proportional intensity model, virtual age, maintenance.
Subjects: H Social Sciences > HA Statistics > HA33 Management Science
Divisions: Divisions > Kent Business School - Division > Department of Analytics, Operations and Systems
Depositing User: Shaomin Wu
Date Deposited: 21 Jan 2015 11:46 UTC
Last Modified: 09 Dec 2022 00:26 UTC
Resource URI: (The current URI for this page, for reference purposes)
Wu, Shaomin:
  • Depositors only (login required):


Downloads per month over past year