Estimating the number of significant components in high-dimensional principal component analysis
高维主成分分析中显著成分数量的估计AI 解读 ↓
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高维主成分分析中显著成分数量的估计AI 解读 ↓
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Abstract We consider the problem of estimating the number of significant components in high-dimensional principal component analysis. We propose a new penalized approach using the explained variance ratio and the rigidity of the nonspiked sample eigenvalues of sample covariance matrices of $ p $ variables. Compared with methods in the existing literature, the consistency of the proposed estimator holds, not only for independent data, but also for some times series data when the dimension $ p $ and the sample size $ n $ both tend to infinity. Even for independent data our estimator works under weaker conditions than existing approaches such as the aic and bic, including allowing heterogeneity in the bulk of the population eigenvalues. Simulation studies are conducted to illustrate the performance of the proposed estimator.