arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.03392stat.MEcs.LG
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稀疏CCA模型在变量选择中的随机效应

Grouping effects of sparse CCA models in variable selection

University of Pennsylvania(宾夕法尼亚大学)

Kefei Liu, Qi Long, Li Shen

摘要:

稀疏典型相关分析(SCCA)是一种双多变量关联模型,它可以找到两组变量的稀疏线性组合,这些变量彼此之间的相关性最大。除了标准的SCCA模型之外,简化的SCCA准则由于其计算简单而在文献中广泛使用,该准则最大化一对典型变量之间的互协方差而不是它们的互相关性。然而,这两个模型的解的行为/性质在理论上仍然未知。本文分析了标准SCCA模型和简化SCCA模型在变量选择上的分组效应。在高维环境中,变量通常形成具有高组内相关性和低组间相关性的组。我们的理论分析表明,对于分组变量选择,简化SCCA联合选择或取消选择一组变量在一起,而标准SCCA随机选择几个主导变量从每个相关组的相关变量。对人工合成数据和真实成像遗传学数据的实验结果验证了我们的理论分析结果。

英文摘要:

The sparse canonical correlation analysis (SCCA) is a bi-multivariate association model that finds sparse linear combinations of two sets of variables that are maximally correlated with each other. In addition to the standard SCCA model, a simplified SCCA criterion which maixmizes the cross-covariance between a pair of canonical variables instead of their cross-correlation, is widely used in the literature due to its computational simplicity. However, the behaviors/properties of the solutions of these two models remain unknown in theory. In this paper, we analyze the grouping effect of the standard and simplified SCCA models in variable selection. In high-dimensional settings, the variables often form groups with high within-group correlation and low between-group correlation. Our theoretical analysis shows that for grouped variable selection, the simplified SCCA jointly selects or deselects a group of variables together, while the standard SCCA randomly selects a few dominant variables from each relevant group of correlated variables. Empirical results on synthetic data and real imaging genetics data verify the finding of our theoretical analysis.

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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