Abstract
The comparisons of coherent systems is a relevant topic in reliability and survival studies. To this purpose, several techniques have been proposed including comparisons of expected lifetimes or comparisons using stochastic orderings. Recently, Samaniego (System Signatures and Their Applications in Engineering Reliability. International Series in Operations Research & Management Science, vol. 110. Springer, New York, 2007) proposed using stochastic precedence to compare the lifetimes of two independent coherent systems. He proved that if the components in both systems are independent and identically distributed (IID), then these comparisons are distribution free, while comparisons based on expected values are not. In the present paper, we obtain new expressions to compare systems using stochastic precedence without the assumption of IID components. In particular, we show that if the components in both systems are independent and satisfy the Cox proportional hazard rate (PHR) model with the same baseline hazard rate, then these comparisons do not depend on the baseline hazard rate function.
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Partially supported by Ministerio de Ciencia y Tecnología under grant MTM2006-12834 and Fundación Séneca (Región de Murcia) under grant 08627/PI/08.
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Navarro, J., Rubio, R. Comparisons of coherent systems using stochastic precedence. TEST 19, 469–486 (2010). https://doi.org/10.1007/s11749-010-0207-1
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DOI: https://doi.org/10.1007/s11749-010-0207-1