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Applying the copula approach on step stress accelerated life test under type Ⅱ censoring

机译:copula方法在Ⅱ型删失下逐步应力加速寿命试验中的应用

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摘要

The copula approach is a way to describe the dependence structure between variables. This could be done through splitting the analysis of the joint distribution of a multivariate random vector into two parts: the analysis of the marginals and the analysis of a copula which describes the dependence structure. An important field of reliability in which the copula approach could be applied, is the accelerated life testing (ALT). When a test unit fails under ALT, there are often more than one fatal cause for the failure. In this paper, we consider the simple step-stress ALT (SSALT) under type II censoring when the lifetime distribution of the different risks are dependent. The dependence structure between the competing risks is described using the copula approach. The point estimates of the unknown parameters are obtained using the maximum likelihood method. Also, the interval estimates for the unknown parameters are constructed using the asymptotic distributions and the parametric bootstrap method. Numerical analysis including simulated data and a real life data set is conducted to study the performance of the estimates.
机译:copula方法是描述变量之间的依存结构的一种方法。这可以通过将对多元随机向量的联合分布的分析分为两部分来完成:对边际的分析和对描述依赖结构的copula的分析。可以应用copula方法的可靠性的重要领域是加速寿命测试(ALT)。当测试单元在ALT下失效时,通常有多个以上的致命原因导致失效。在本文中,我们考虑了当不同风险的生命周期分布相互依赖时,II型删失下的简单步进应力ALT(SSALT)。使用copula方法描述了竞争风险之间的依赖关系结构。使用最大似然法获得未知参数的点估计。同样,使用渐近分布和参数自举方法构造未知参数的区间估计。进行了包括模拟数据和现实生活数据集的数值分析,以研究估计的性能。

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