arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2106.03014math.PR
收藏

几何和、大小偏置和零偏置

Geometric sums, size biasing and zero biasing

Qingwei Liu, Aihua Xia

摘要:

几何和在风险理论和可靠性理论\cite{Kala97}中起着重要的作用,几何和的一个典型例子是Rényi定理~ \cite{Renyi56},它说一个适当参数化的几何和序列收敛于指数分布。指数分布逼近几何和\cite{Sugakova95,Kala97,PekozRollin11}的精度已有广泛的研究,而Γ分布逼近负二项和的自然对应的精度研究较少。本文证明了非负随机变量服从Γ分布当且仅当其大小偏置等于零偏置。我们结合Stein的方法建立简单的界限Γ分布逼近的非负独立随机变量的总和,一类复合泊松分布和负二项和的随机变量。

英文摘要:

The geometric sum plays a significant role in risk theory and reliability theory \cite{Kala97} and a prototypical example of the geometric sum is Rényi's theorem~\cite{Renyi56} saying a sequence of suitably parameterised geometric sums converges to the exponential distribution. There is extensive study of the accuracy of exponential distribution approximation to the geometric sum \cite{Sugakova95,Kala97,PekozRollin11} but there is little study on its natural counterpart of gamma distribution approximation to negative binomial sums. In this note, we show that a nonnegative random variable follows a gamma distribution if and only if its size biasing equals its zero biasing. We combine this characterisation with Stein's method to establish simple bounds for gamma distribution approximation to the sum of nonnegative independent random variables, a class of compound Poisson distributions and the negative binomial sum of random variables.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑