二维绝对中心矩的几个性质

Some Properties of the Bivariate Absolute Central Moment

本文讨论了独立随机变量之和的绝对中心矩的几个性质,其中包括E|(X+Y)-E(X+Y)|-E|(X-Y)-E(X-Y)|的表达式,这里X和Y是相对独立的随机变量.

This paper discusses several properties of the absolute central monment of sums of independent random variable including the expression E｜（X＋Y）-E（X＋Y）｜-E｜（X-Y）-E（X-Y）｜,in which Xand Y are i. i.d. random variables.