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arXiv 1104.4289math.STstat.TH
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高维低样本量下稀疏PCA的一致性

Consistency of Sparse PCA in High Dimension, Low Sample Size Contexts

Dan Shen, Haipeng Shen, J. S. Marron

摘要:

稀疏主成分分析(PCA)方法是对复杂数据进行降维(或变量数目)的有效工具。稀疏主成分(PC)比传统的PC更容易解释,因为大多数载荷为零。我们研究了这些稀疏PC方向的渐近性质的情况下,固定样本量和增加的维度(即高维,低样本量(HDLSS))。在先前研究的尖峰协方差假设下,我们表明稀疏PCA在先前为传统PCA建立的相同大尖峰条件下保持一致。在广泛的小尖峰条件下,我们发现了一个大的稀疏性假设,稀疏PCA是一致的,但PCA是强烈不一致的。一致性区域的边界使用一个oracle结果来澄清。

英文摘要:

Sparse Principal Component Analysis (PCA) methods are efficient tools to reduce the dimension (or the number of variables) of complex data. Sparse principal components (PCs) are easier to interpret than conventional PCs, because most loadings are zero. We study the asymptotic properties of these sparse PC directions for scenarios with fixed sample size and increasing dimension (i.e. High Dimension, Low Sample Size (HDLSS)). Under the previously studied spike covariance assumption, we show that Sparse PCA remains consistent under the same large spike condition that was previously established for conventional PCA. Under a broad range of small spike conditions, we find a large set of sparsity assumptions where Sparse PCA is consistent, but PCA is strongly inconsistent. The boundaries of the consistent region are clarified using an oracle result.

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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