data test;
input bin $ prob;
cards;
a .2
a .3
a .6
a .8
b .5
b .6
b .7
b .8
c .1
c .4
c .5
c .7
c .8
;
run;
data want;
n=0;
do until(last.bin);
set test;
by bin;
n+1;
end;
sum=0;
do until(last.bin);
set test;
by bin;
sum+prob;cum_per=sum/n;output;
end;
drop n sum;
run;
Xia Keshan
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