OPTIONS NODATE NONUMBER LS=72;

DATA in;
   INPUT x1 $ x2 y @@; 
   sqrty = SQRT(y);
CARDS;
A 1 1   A 1 2   A 2 3   A 2 4   A 2 3
B 1 6   B 1 8   B 2 5   B 2 0   B 1 3
;
PROC SORT DATA=in; BY x1 x2;

PROC PRINT DATA=in;

PROC MEANS DATA=in; BY x1;
     VAR y;

PROC MEANS DATA=in; BY x1 x2;
     VAR y;

PROC FREQ DATA=in;
     TABLES x1 x2 x1*x2;

PROC UNIVARIATE DATA=in PLOT; BY x1;
     VAR y;
RUN;