arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0711.0198stat.MEmath.STstat.TH
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比率置信集的几何方法:Fieller定理、推广和Bootstrap

A Geometric Approach to Confidence Sets for Ratios: Fieller's Theorem, Generalizations, and Bootstrap

Ulrike von Luxburg, Volker H. Franz

摘要:

本文提出了一种几何方法来确定随机变量X和Y的均值比E(Y)/E(X)的置信集。该方法将两个随机变量之比的置信集构造问题归结为一维随机变量均值的置信集构造问题。它适用于各种各样的情况。在正态分布随机变量的情况下,这样构造的置信集与标准的Fieller置信集一致。我们的建设的推广导致非常一般的分布类的精确和保守的置信集的定义,提供的联合期望(X,Y)的存在和线性组合的形式aX + bY是良好的行为。最后,我们的几何方法允许导出一个非常简单的引导方法,用于构建保守的置信度集的比率,在某些情况下,特别是在不对称的重尾制度。

英文摘要:

We present a geometric method to determine confidence sets for the ratio E(Y)/E(X) of the means of random variables X and Y. This method reduces the problem of constructing confidence sets for the ratio of two random variables to the problem of constructing confidence sets for the means of one-dimensional random variables. It is valid in a large variety of circumstances. In the case of normally distributed random variables, the so constructed confidence sets coincide with the standard Fieller confidence sets. Generalizations of our construction lead to definitions of exact and conservative confidence sets for very general classes of distributions, provided the joint expectation of (X,Y) exists and the linear combinations of the form aX + bY are well-behaved. Finally, our geometric method allows to derive a very simple bootstrap approach for constructing conservative confidence sets for ratios which perform favorably in certain situations, in particular in the asymmetric heavy-tailed regime.

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。

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