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Load-Sharing Model under Lindley Distribution and Its Parameter Estimation Using the Expectation-Maximization
Chanseok Park1, Min Wang2, Refah Mohammed Alotaibi3
1Applied Statistics Laboratory, Department of Industrial Engineering, Pusan National University, Busan 46241, Korea.
Abstract:
A load-sharing system is defined as a parallel system whose load will be redistributed to its surviving components as each of the components fails in the system. Our focus is on making statistical inference of the parameters associated with the lifetime distribution of each component in the system. In this paper, we introduce a methodology which integrates the conventional procedure under the assumption of the load-sharing system being made up of fundamental hypothetical latent random variables. We then develop an expectation maximization algorithm for performing the maximum likelihood estimation of the system with Lindley-distributed component lifetimes. We adopt several standard simulation techniques to compare the performance of the proposed methodology with the Newton-Raphson-type algorithm for the maximum likelihood estimate of the parameter. Numerical results indicate that the proposed method is more effective by consistently reaching a global maximum.
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