NONNEGATIVITY OF COVARIANCES BETWEEN FUNCTIONS OF ORDERED RANDOM VARIABLES

Author:

Hu Taizhong,Yao Junchao,Lu Qingshu

Abstract

In this article we investigate conditions by a unified method under which the covariances of functions of two adjacent ordered random variables are nonnegative. The main structural results are applied to several kinds of ordered random variable, such as delayed record values, continuous and discrete ℓ-spherical order statistics, epoch times of mixed Poisson processes, generalized order statistics, discrete weak record values, and epoch times of modified geometric processes. These applications extend the main results for ordinary order statistics in Qi [28] and for usual record values in Nagaraja and Nevzorov [25].

Publisher

Cambridge University Press (CUP)

Subject

Industrial and Manufacturing Engineering,Management Science and Operations Research,Statistics, Probability and Uncertainty,Statistics and Probability

Reference39 articles.

1. 38. Wei G. & Hu T. (2006). Characterizations of aging classes in terms of spacings between record values. Technical report, Department of Statistics and Finance, University of Science and Technology of China, Hefei.

2. Limit theorems for records from discrete distributions

3. A counterexample to a conjecture on order statistics

4. Some results on covariance of function of order statistics

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