SOME RESULTS ON REVERSED HAZARD RATE ORDERING

Abstract

Recently, the reversed hazard rate (RHR) function, defined as the ratio of the density to the distribution function, has become a topic of interest having applications in actuarial sciences, forensic studies and similar other fields. Here we establish results with respect to RHR ordering between the exponentiated random variables. We also address the ordering results between component redundancy and system redundancy. Both the cases of matching spares and non-matching spares are discussed. In case of matching spares, a sufficient condition has been given for component redundancy to be superior to the system redundancy with respect to the reversed hazard rate ordering for any coherent system.

Keywords:

• Coherent system
• Component redundancy and system redundancy
• Exponentiated random variables
• Matching spares

ACKNOWLEDGMENTS

The work was done while the second author was visiting the University of New Brunswick, Saint John, Canada, E2L-4L5. Part of this work was supported by the grant from The Natural Sciences and Engineering Research Council of Canada, Grant No. OGP-0004850.