Partitioned Running Totals in SAS

Question

How can I create a new column for an existing dataset that is the running total of an existing column - partitioned by some identifier?

ID |  Value |     New Val         


        

Answer 1

Here's another option:

data want;
do until (last.id);
    set have;
    by id;
    new_value + value;
    output;
end;
new_value = 0;
run;