Generalized linear spectral statistics of high-dimensional sample covariance matrices and its applications
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高维样本协方差矩阵的广义线性谱统计及其应用AI 解读 ↓
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In this paper, we introduce the Generalized Linear Spectral Statistics (GLSS) of a high-dimensional sample covariance matrix Sn, denoted as trf(Sn)Bn, which effectively captures distinct spectral properties of Sn by incorporating an ancillary matrix Bn and a test function f. The joint asymptotic normality of GLSS associated with different test functions is established under mild assumptions on Bn and the underlying distribution, when the dimension n and sample size N are comparable. The convergence rate of GLSS is determined by N/rank(B n). Subsequently, we propose a novel functional projection approach based on GLSS for hypothesis testing on eigenspaces of “population-spiked” covariance matrices, showcasing a universality phenomenon in the magnitude of the spikes. The theoretical accuracy of our results established for GLSS and the advantages of the newly suggested testing procedure are demonstrated through various numerical studies.