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Stochastic ordering in residual mixing distributions

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Author
Campbell, David Russell
Date
1974-07
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Abstract
A mixture of failure rates can be present in an apparently homogeneous population of "devices" because of variability either in their manufacture or in the severity of their service environments. A mixing distribution is the probability distribution for different failure rates in such a population. A residual mixing distribution is the probability distribution for different failure rates in the population of surviving devices after a specified period of service or "burn in." Residual mixing distributions resulting from arbitrary mixtures of constant failure rates are shown to be stochastically ordered (decreasingly) as the period of service or burn in is increased, and to approach in the limit a distribution degenerate at the smallest failure rate "present" in the population. The results are direct applications of basic propositions concerning monotonicity properties of residual mixing random variables and their expectations. They contain some well known results about the failure rate of an item drawn from a mixed population of constant failure rates as immediate consequences. (Author)
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/29114
NPS Report Number
NPS-64Cm74071
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