其一般形式是： PROC SUMMARY data=<源数据集名> nway missing; class <变量名>； var <变量名>; output out=<数据集名> sum()= max()= min()= mean()= ; run;
PROC SUMMARY <option(s)> <statistic-keyword(s)>; BY variable-1<… variable-n> ; CLASS variable(s) </ option(s)>; FREQ variable; ID variable(s); OUTPUT <OUT=SAS-data-set><output-statistic-specification(s)> <id-group-specification(s)> <maximum-id-specification(s)> <minimum-id-specification(s)></ option(s)> ; TYPES request(s); VAR variable(s)</ WEIGHT=weight-variable>; WAYS list; WEIGHT variable;
