Typo, there was a space after the word percent which shouldn't be there:
data times;
input time@@;
datalines;
10.9 11.5 9.8 12.7 10.6
9.2 10.3 9.0 10.6 9.4
8.7 9.7 8.2 9.4 8.5
7.2 8.6 7.5 9.7 7.7
;
run;
data want;
set times;
do amount=0.9 to 0.6 by -0.1;
do concentration=1 to 3 by 0.5;
output;
end;
end;
format concentration percent4.1;
run;
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