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arXiv 2209.03556math.STmath.PRstat.MEstat.TH
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高维椭圆模型中谱统计的Bootstrap方法

A Bootstrap Method for Spectral Statistics in High-Dimensional Elliptical Models

Siyao Wang, Miles E. Lopes

AI总结:

针对高维椭圆模型中谱统计推断bootstrap方法研究不足的问题,扩展原有IC模型的bootstrap方法以适配椭圆模型,理论上证明其可一致逼近线性谱统计量分布,实证显示对非线性谱统计量也表现良好。

摘要:

尽管已有大量关于高维样本协方差矩阵特征值的文献,但其中大多专门针对独立成分(IC)模型——该模型中观测值被表示为具有独立元素的随机向量的线性变换。相比之下,椭圆模型背景下的相关研究较少,这类模型违背了IC模型的独立性结构,且呈现出截然不同的统计现象。尤其值得注意的是,人们对高维椭圆模型中用于谱统计推断的bootstrap方法的适用范围知之甚少。为填补这一空白,我们展示了如何将此前为IC模型开发的bootstrap方法进行扩展,以适配椭圆模型的不同特性。在此设定下,我们的主要理论结果保证了所提方法能够一致逼近在多元分析中发挥核心作用的线性谱统计量的分布。我们还提供了实证结果,表明所提方法对多种非线性谱统计量也表现良好。

英文摘要:

Although there is an extensive literature on the eigenvalues of high-dimensional sample covariance matrices, much of it is specialized to independent components (IC) models -- in which observations are represented as linear transformations of random vectors with independent entries. By contrast, less is known in the context of elliptical models, which violate the independence structure of IC models and exhibit quite different statistical phenomena. In particular, very little is known about the scope of bootstrap methods for doing inference with spectral statistics in high-dimensional elliptical models. To fill this gap, we show how a bootstrap approach developed previously for IC models can be extended to handle the different properties of elliptical models. Within this setting, our main theoretical result guarantees that the proposed method consistently approximates the distributions of linear spectral statistics, which play a fundamental role in multivariate analysis. We also provide empirical results showing that the proposed method performs well for a variety of nonlinear spectral statistics.

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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