【SAS BASE】PROC MEAS

PROC MEANS OPTIONS; /*默认输出：非缺省数目、均值、标准差、最小值、最大值*/
    BY variable-list;/*必须要预先排序*/
    CLASS variable-list;/*功能与BY语句相同，不需要预先排序*/
     VAR variable-list;
     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_*/
                                       /*例：MEAN(Lions Bears)=Lionweight Bearweight*/