A Bi-Level Weibull Model with Applications to Two Ordered Events

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Published Nov 16, 2020
Shuguang Song Hanlin Liu Mimi Zhang Min Xie

Abstract

In this paper, we propose and study a new bivariate Weibull model, called Bi-levelWeibullModel, which arises when one failure occurs after the other. Under some specific regularity conditions, the reliability function of the second event can be above the reliability function of the first event, and is always above the reliability function of the transformed first event, which is a univariate Weibull random variable. This model is motivated by a common physical feature that arises fromseveral real applications. The two marginal distributions are a Weibull distribution and a generalized three-parameter Weibull mixture distribution. Some useful properties of the model are derived, and we also present the maximum likelihood estimation method. A real example is provided to illustrate the application of the model.

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Keywords

Bi-level Weibull distribution, Generalized three-parameter Weibull mixture, Maximum likelihood estimation

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Technical Papers