arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.0177math.STmath.PRstat.MEstat.TH
收藏

多元Delta方法正态收敛收敛速率的最优阶界

Optimal-order bounds on the rate of convergence to normality in the multivariate delta method

Iosif Pinelis, Raymond Molzon

摘要:

给出了一般抽象非线性统计量最优阶逼近正态性的一致和非一致Berry Esseen(BE)界,并利用BE界得到了向量统计量Delta方法收敛速率的最优界.具体应用皮尔逊,非中心学生和霍特林的统计,球形检验统计量,正则化典型相关,最大似然估计(MLE),所有这些均匀和非均匀BE界似乎是第一个已知的结果,这些种类,除了均匀BE界MLE。当应用到中央学生统计量的研究情况下,我们的一般结果比较以及与已知的情况下,以前通过专门的方法获得的。证明使用Stein型方法开发的陈和邵,Cramér型的倾斜变换,指数和Rosenthal型不等式的总和随机向量建立Pinelis,Sakhanenko,和Utev,以及一些其他的,相当近期的结果,本研究的动机。该方法允许一个获得明确的界限,而中等大小的常数,至少就统一的界限而言。例如,基于具有$\mathbb{E} Y_1=\mathbb{E} Z_1=\mathbb{E} Y_1Z_1=0$和$\mathbb{E} Y_1^2=\mathbb{E} Z_1^2=1$的独立同分布随机对$(Y_1,Z_1),\dots,(Y_n,Z_n)$,对于皮尔逊样本相关系数,具有均匀BE界$3.61\mathbb{E}(Y_1^6+Z_1^6)\,(1+σ^{-3})/\sqrt n$,其中$σ:=\sqrt{\mathbb{E} Y_1^2Z_1^2}$。

英文摘要:

Uniform and nonuniform Berry--Esseen (BE) bounds of optimal orders on the closeness to normality for general abstract nonlinear statistics are given, which are then used to obtain optimal bounds on the rate of convergence in the delta method for vector statistics. Specific applications to Pearson's, non-central Student's and Hotelling's statistics, sphericity test statistics, a regularized canonical correlation, and maximum likelihood estimators (MLEs) are given; all these uniform and nonuniform BE bounds appear to be the first known results of these kinds, except for uniform BE bounds for MLEs. When applied to the well-studied case of the central Student statistic, our general results compare well with known ones in that case, obtained previously by specialized methods. The proofs use a Stein-type method developed by Chen and Shao, a Cramér-type of tilt transform, exponential and Rosenthal-type inequalities for sums of random vectors established by Pinelis, Sakhanenko, and Utev, as well as a number of other, quite recent results motivated by this study. The method allows one to obtain bounds with explicit and rather moderate-size constants, at least as far as the uniform bounds are concerned. For instance, one has the uniform BE bound $3.61\mathbb{E}(Y_1^6+Z_1^6)\,(1+σ^{-3})/\sqrt n$ for the Pearson sample correlation coefficient based on independent identically distributed random pairs $(Y_1,Z_1),\dots,(Y_n,Z_n)$ with $\mathbb{E} Y_1=\mathbb{E} Z_1=\mathbb{E} Y_1Z_1=0$ and $\mathbb{E} Y_1^2=\mathbb{E} Z_1^2=1$, where $σ:=\sqrt{\mathbb{E} Y_1^2Z_1^2}$.

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。

↑