SAS is popular statistic analysis software at present,using GENMOD method,look for the difference on statistics from the output information,so as to test and certify the reliability of the conclusion.

• SAS是目前流行的统计分析软件,用广义估计方程(GENMOD)方法,从输出的信息寻找统计上的差异性,来检验和证实结论可靠性。