Likelihood ratio order of the second order statistic from independent heterogeneous exponential random variables

Likelihood ratio order of the second order statistic from independent heterogeneous exponential random variables
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独立异质指数随机变量的二阶统计量的似然比阶

DOI:
10.1016/j.jmva.2008.09.010
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发表时间:
2009-05
影响因子:
1.6
通讯作者:
Li, Xiaohu
Li, Xiaohu
中科院分区:
数学2区
文献类型:
--
作者:
Balakrishnan, N.;Zhao, Peng;Li, Xiaohu

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设X1,…,Xnbe独立指数随机变量具有各自的风险率λ1,…,λn,并设Y1,…,具有共同风险率λ的独立指数随机变量。本文证明了X1,…的二阶统计量X2:N,Xn,大于Y1,…的二阶统计量Y2:N,Yn的似然比序当且仅当Λk=∑i=1nλik,k=1,2,3.还证明了X2:NIS小于Y2:n的似然比序当且仅当这些结果是对PaˇLtaˇNEA[E.PAˇLtaˇNEA,On in the Compare in the Compare of Fail-Safe Systems,Journal of Fail-Safe System》(统计规划与推理杂志第138(2008),1993-1997)中关于危险率序的结果的良好推广.
Let X1,…,Xnbe independent exponential random variables with respective hazard rates λ1,…,λn, and let Y1,…,Ynbe independent exponential random variables with common hazard rate λ. This paper proves that X2:n, the second order statistic of X1,…,Xn, is larger than Y2:n, the second order statistic of Y1,…,Yn, in terms of the likelihood ratio order if and only if with Λk=∑i=1nλik,k=1,2,3. Also, it is shown that X2:nis smaller than Y2:nin terms of the likelihood ratio order if and only if These results form nice extensions of those on the hazard rate order in Paˇltaˇnea [E. Paˇltaˇnea, On the comparison in hazard rate ordering of fail-safe systems, Journal of Statistical Planning and Inference 138 (2008) 1993–1997].
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