You need
data want;
set have;
by id;
retain index increase;
if first.id then do;
index = 0;
increase = 0;
end;
if binary then do;
increase = 1;
end;
output;
index = index + increase;
drop increase;
run;
You need
data want;
set have;
by id;
retain index increase;
if first.id then do;
index = 0;
increase = 0;
end;
if binary then do;
increase = 1;
end;
output;
index = index + increase;
drop increase;
run;
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