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arXiv 0705.1701math.PRmath.STstat.TH
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某些样本协方差阵系综最大特征值的普适性结果

Universality results for largest eigenvalues of some sample covariance matrix ensembles

Sandrine Peche

摘要:

对于具有亚高斯尾的iid元的样本协方差阵,当样本个数和变量个数都变大且比值趋于1时,这是A. Soshnikov证明了最大特征值的极限分布与高斯样本的极限分布相同.在本文中,我们将这个结果推广到两种情况。第一种情况是当比率接近任意有限值时。第二种情况是当比率变为无穷大或任意小时。

英文摘要:

For sample covariance matrices with iid entries with sub-Gaussian tails, when both the number of samples and the number of variables become large and the ratio approaches to one, it is a well-known result of A. Soshnikov that the limiting distribution of the largest eigenvalue is same as the of Gaussian samples. In this paper, we extend this result to two cases. The first case is when the ratio approaches to an arbitrary finite value. The second case is when the ratio becomes infinity or arbitrarily small.

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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