当然可以用SAS做了，百度这样的资料：http://wenku.baidu.com/link?url=f_ebhmj2k4LuhFYN2oIQiTr-en3SfGqfYtXvhsr7MpsNAWvF0nIjULuhuTN23y5PRMHAM_b_-1K8ZKDhCoWt46AUBxT-OCm4Flzk1FSQY2O
