A few things, when you do "<=0.99" that is different than later when you specify ">=0". Also, I think you may have observations that are exactly equal to 1,2,3,4,5 but your bucketing does not capture them.
Given that I think you are trying to bucket the observations, I would use proc format instead. (if you don't want to include 1, 2, 3, etc. change 1-1.99 to 1<-1.99, 2-2.99 to 2<-2.99 etc.)
proc format;
value poorcat low-0.99=1 1-1.99=2 2-2.99=3 3-3.99=4 4-4.99=5 5-5.99=6 other=0;
run;
data have;
set sashelp.syr1001(keep=S0666);
poor_cat=put(S0666, poorcat.);
run;
data want;
set have;
if poor_cat ne 0;
run;
-unison
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