Analysis of Field Reliability Data with Supplementary Information on Degradation Data and Covariates

열화자료와 설명변수 정보를 고려한 사용현장 신뢰성 자료의 분석

  • 서순근 (동아대학교 산업시스템공학과) ;
  • 하천수 (동아대학교 산업시스템공학과)
  • Published : 2002.10.01

Abstract

Degradation data can provide more reliability information than traditional failure-time data, especially products with few or no failures. This paper is concerned with a method of estimating lifetime distribution from field data with supplementary information on degradation data and covariates. When a distribution of degradation rate obtained by follow-up study for a portion of products that survive after-warranty follows a reciprocal-Weibull or lognormal distribution. A time-to-failure distribution of the product follows Weibull or lognormal distribution, respectively. A method of estimating lifetime parameters for this kind of data and their asymptotic properties are studied. Effects of after-warranty report probability, follow-up rate, and proportion of degradation data on pseudo maximum likelihood estimators of these parameters are investigated.

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