Published In
Probability in Engineering and Information Sciences
Document Type
Pre-Print
Publication Date
3-17-2022
Subjects
Probability and statistics
Abstract
Let X1,…,Xn be mutually independent exponential random variables with distinct hazard rates λ1,…,λn > 0 and let Y1,…,Yn be a random sample from the exponential distribution with hazard rate $\bar \lmd = \sum_{i=1}^n \lmd_i/n$. Also let X1:n < ⋯ < Xn:n and Y1:n < ⋯ < Yn:n be their associated order statistics. It is shown that for 1 ≤ i < j ≤ n, the generalized spacing Xj:n - X i:n is more dispersed than Yj:n− Yi:n according to dispersive ordering. This result is used to solve a long standing open problem that for 2 ≤ i ≤ n the dependence of Xi:n on X1:n is less than that of Yi:n on Y1:n, in the sense of the more stochastically increasing. This dependence result is also extended to the PHR model. This extends the earlier work of {\em Genest, Kochar and Xu}[ J.\ Multivariate Anal.\ {\bf 100} (2009) \ 1587-1592] who proved this result for i=n.
Rights
© 2022 Subhash C. Kochar
DOI
10.1017/S0269964822000146
Persistent Identifier
https://archives.pdx.edu/ds/psu/37228
Citation Details
Kochar, Subhash C., (2022). [PRE-PRINT] "Dependence Comparisons of Order Statistics in the Proportional Hazards Model," To be published in Probability in Engineering and Information Sciences.
Description
This is a pre-copyedited, author-produced PDF of an article accepted for publication in Probability in Engineering and Information Sciences following peer review. The version of record will be available online at: https://doi.org/10.1017/S0269964822000146