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- Title
A Ridge Penalized Principal-Components Approach Based on Heritability for High-Dimensional Data.
- Authors
Wang, Yuanjia; Fang, Yixin; Jin, Man
- Abstract
Objective: To develop a ridge penalized principal-components approach based on heritability that can be applied to high-dimensional family data. Methods: The first principal component of heritability for a trait constellation is defined as a linear combination of traits that maximizes the heritability, which is equivalent to maximize the family-specific variation relative to the subject-specific variation. To analyze high-dimensional data and prevent overfitting, we propose a penalized principal-components approach based on heritability by adding a ridge penalty to the subject-specific variation. We choose the optimal regularization parameter by cross-validation. Results: The principal-components approach based on heritability with and without ridge penalty was compared to the usual principal-components analysis in four settings. The penalized principal-components of heritability analysis had substantially larger coefficients for the traits with genetic effect than for the traits with no genetic effect, while the non-regularized analysis failed to identify the genetic traits. In addition, linkage analysis on the combined traits showed that the power of the proposed methods was higher than the usual principal-components analysis and the non-regularized principal-components of heritability analysis. Conclusions: The penalized principal-components approach based on heritability can effectively handle large number of traits with family structure and provide power gain for linkage analysis. The cross-validation procedure performs well in choosing optimal magnitude of penalty. Copyright © 2007 S. Karger AG, Basel
- Publication
Human Heredity, 2007, Vol 64, Issue 3, p182
- ISSN
0001-5652
- Publication type
Article
- DOI
10.1159/000102991