R语言

http://wenku.baidu.com/view/a747fd4733687e21af45a90d.html

http://wenku.baidu.com/link?url=VsnpZzpk-ITFfuM2xFPkSVG-FvZ6LS6hzS2zSAdfiMoNUz-3nruYGJcYTcwpYHXrCQS61_NQy4GGH8SAH05KIzazn6irx7D2etHzyA9HMUC

http://wenku.baidu.com/link?url=KYtTnXqGV4yoIZwzopqBBFVWNAZN2oCPRqM7EWdT2q4Q487spflo2p0guF4inh0iAm3D89oGHCPPYv2KGwF8OVA8qk0Fn6gQCyo0l9AWwya

http://blog.sina.com.cn/s/blog_403aa80a0101aowm.html

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