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* make data for a*b*c 3 by 2 by 3 design with ;
* factor c repeated
data test;
do a = 1 to 3;
do b = 1 to 2;
do c = 1 to 3;
x = ranuni(-1);
output;
end;
end;
end;
run;
* test bcomp (b1 vs b2) at a2 c3 ;
* note order of variables in class statement ;
* determines how quickly vars change in contrast ;
* statement. a changes slowest, then b, and c changes ;
* fastest ;
proc mixed data=test;
class a b c ;
model x = a b c a*b a*c b*c a*b*c ;
contrast 'bcomp at a2 c3' a 0 0 0
b 1 -1
c 0 0 0
a*b 0 0
1 -1
0 0
a*c 0 0 0
0 0 0
0 0 0
b*c 0 0 1
0 0 -1
a*b*c 0 0 0
0 0 0
0 0 1
0 0 -1
0 0 0
0 0 0 ;
run;
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