By default, the MEANS procedure generates statistics for every numeric variable in a data set. But the typical focus is on just a few variables, particularly if the data set is large. It also makes sense to exclude certain types of variables. The values of a numeric identifier variable ID, for example, are unlikely to yield useful statistics.

To specify the variables that PROC MEANS analyzes, add a VAR statement and list the variable names.

proc means data=clinic.diabetes min max maxdec=0; 
   var age height weight; 
run;

In addition to listing variables separately, you can use a numbered range of variables.

proc means data=perm.survey mean stderr maxdec=2; 
   var item1-item5; 
run;