1 PROC MEANS OPTIONS; /*默认输出:非缺省数目、均值、标准差、最小值、最大值*/ 2 BY variable-list;/*必须要预先排序*/ 3 CLASS variable-list;/*功能与BY语句相同,不需要预先排序*/ 4 VAR variable-list; 5 OUTPUT OUT=data-set statistic(variable-list)=name-list; /*除了VAR与语句中的变量名外,还有两变量:_TYPE_和_FREQ_*/ 6 /*例:MEAN(Lions Bears)=Lionweight Bearweight*/