2011-04-27 主成分分析 http://blog.livedoor.jp/no_bai_saa/?p=3http://d.hatena.ne.jp/naoya/20090301/hitshttp://books.google.com/books?q=%22factor+analysis%22&btnG=Search+Books&as_brr=0 http://www.ec.kagawa-u.ac.jp/~hori/spss/factorlink.html