Principal component analysis
R的內建PCA指令 — princomp / prcomp [定義篇] | 演衡學習筆記
http://c3h3notes.wordpress.com/2010/11/16/r%E7%9A%84%E5%85%A7%E5%BB%BApca%E6%8C%87%E4%BB%A4-princomp/
Introduction to Dimension Reduction | 演衡學習筆記
http://c3h3notes.wordpress.com/2010/10/29/introduction-to-dimension-reduction/
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