Estimation of the number of principal components in high‐dimensional multivariate extremes
针对高维多元极值数据，利用主成分分析降维，并开发AIC和BIC准则来估计显著主成分的数量，通过模拟和降水数据验证方法有效性。
Abstract For multivariate regularly random vectors of dimension , the dependence structure of the extremes is modeled by the so‐called angular measure. When the dimension is high, estimating the angular measure is challenging because of its complexity. In this paper, we use Principal Component Analysis (PCA) as a method for dimension reduction and estimate the number of significant principal components of the empirical covariance matrix of the angular measure under the assumption of a spiked covariance structure. Therefore, we develop Akaike Information Criteria () and Bayesian Information Criteria () to estimate the location of the spiked eigenvalue of the covariance matrix, reflecting the number of significant components, and explore these information criteria on consistency. On the one hand, we investigate the case where the dimension is fixed, and on the other hand, where the dimension converges to under different high‐dimensional scenarios. When the dimension is fixed, we establish that the is not consistent, whereas the is weakly consistent. In high‐dimensional contexts, we utilize methods from random matrix theory to establish sufficient conditions ensuring the consistency of the AIC and BIC. Finally, the performance of the different information criteria is compared in a simulation study and applied to high‐dimensional precipitation data.