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Usual stochastic ordering of the sample maxima from dependent distribution-free random variables
Authors:Longxiang Fang  Narayanaswamy Balakrishnan  Wenyu Huang  Shuai Zhang
Affiliation:1. Department of Mathematics and Statistics, Anhui Normal University, Wuhu, P.R. China;2. Department of Mathematics and Statistics, McMaster University, Hamilton, Ontario, Canada
Abstract:In this paper, we discuss stochastic comparison of the largest order statistics arising from two sets of dependent distribution-free random variables with respect to multivariate chain majorization, where the dependency structure can be defined by Archimedean copulas. When a distribution-free model with possibly two parameter vectors has its matrix of parameters changing to another matrix of parameters in a certain mathematical sense, we obtain the first sample maxima is larger than the second sample maxima with respect to the usual stochastic order, based on certain conditions. Applications of our results for scale proportional reverse hazards model, exponentiated gamma distribution, Gompertz–Makeham distribution, and location-scale model, are also given. Meanwhile, we provide two numerical examples to illustrate the results established here.
Keywords:Archimedean copula  distribution-free model  multivariate chain majorization  scale proportional reverse hazards model  usual stochastic ordering
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