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arXiv 0912.1950math.PR
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随机矩阵的测度和谱的集中:应用于相关阵、椭圆分布及其它

Concentration of measure and spectra of random matrices: Applications to correlation matrices, elliptical distributions and beyond

Noureddine El Karoui

摘要:

我们将自己置于高维统计推断的设置中,其中感兴趣的数据集中的变量$p$的数量与观测值$n$的数量具有相同的数量级。更正式地说,我们研究的相关性协方差阵的渐近性质,在设置$p/n\toρ\in(0,\infty),$一般人口协方差。我们证明了,对于随机矩阵理论中研究的一大类模型,高维相关阵的谱性质与高维协方差矩阵的谱性质相似。我们还推导出一个Marucenko-帕斯图尔型方程组的限制谱分布的协方差阵计算的数据与椭圆分布和推广这个家庭。本研究的动机部分来自于这种分布假设可能与计量经济学和投资组合优化问题以及某些经典随机矩阵结果的鲁棒性问题相关。一个数学主题的文件是重要的使用,我们使浓度不等式。

英文摘要:

We place ourselves in the setting of high-dimensional statistical inference, where the number of variables $p$ in a data set of interest is of the same order of magnitude as the number of observations $n$. More formally, we study the asymptotic properties of correlation and covariance matrices, in the setting where $p/n\toρ\in(0,\infty),$ for general population covariance. We show that, for a large class of models studied in random matrix theory, spectral properties of large-dimensional correlation matrices are similar to those of large-dimensional covarance matrices. We also derive a Marucenko--Pastur-type system of equations for the limiting spectral distribution of covariance matrices computed from data with elliptical distributions and generalizations of this family. The motivation for this study comes partly from the possible relevance of such distributional assumptions to problems in econometrics and portfolio optimization, as well as robustness questions for certain classical random matrix results. A mathematical theme of the paper is the important use we make of concentration inequalities.

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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