SAS proc means

proc_means.sas

/* summary statistics for full sample */
proc means data=work.myData n mean  median stddev;
  OUTPUT OUT=work.meansout n= mean= median= stddev= /autoname;
  var var1 var2 var3;
run;

/* as above, but repeated by a group (requires sorting on that variable) */
proc means data=work.myData n mean median stddev;
  OUTPUT OUT=work.meansout n= mean= median= stddev= /autoname;
  var var1 var2 var3;
  by groupvar;
run;