A New Test for New Better Than Used in Expectation Lifetimes

Edgardo Lorenzo, Ganesh Malla and Hari Mukerjee

Communications in Statistics - Theory and Methods, 2015, vol. 44, issue 23, 4927-4939

Abstract: The mean residual life of a non negative random variable X with a finite mean is defined by M(t) = E[X − t|X > t] for t ⩾ 0. A popular nonparametric model of aging is new better than used in expectation (NBUE), when M(t) ⩽ M(0) for all t ⩾ 0. The exponential distribution lies at the boundary. There is a large literature on testing exponentiality against NBUE alternatives. However, comparisons of tests have been made only for alternatives much stronger than NBUE. We show that a new Kolmogorov-Smirnov type test is much more powerful than its competitors in most cases.

Date: 2015
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DOI: 10.1080/03610926.2013.824101

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