data have;
input group pre post;
diff = post-pre;
cards;
0 4 8
0 9 9
0 17 17
0 2 0
0 6 11
0 6 6
0 21 21
0 10 5
0 12 9
0 10 11
1 3 2
1 16 13
1 18 14
1 11 12
1 4 3
1 10 7
1 7 13
1 9 11
1 2 6
1 21 21
1 8 8
1 1 8
1 5 6
1 13 8
;
run;
proc anova data=have;
class group;
model diff = group;
means group / tukey;
quit;
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