I can use the monotonic() function to assign a sequence number for each row. But I want it to reset at each new POLICY_NO.
How can I accomplish this?
POLICY_NO | WANT |
1 | 1 |
1 | 2 |
1 | 3 |
1 | 4 |
1 | 5 |
1 | 6 |
1 | 7 |
2 | 1 |
2 | 2 |
2 | 3 |
3 | 1 |
4 | 1 |
4 | 2 |
4 | 3 |
4 | 4 |
4 | 5 |
4 | 6 |
5 | 1 |
5 | 2 |
Use datastep, easier:
data want; set have; by policy_no; retain want; if first.policy_no then want=1; else sum(want,1); run;
Use datastep, easier:
data want; set have; by policy_no; retain want; if first.policy_no then want=1; else sum(want,1); run;
Many thanks!
@rw9 Does "else sum(want,1);" work in a data step?
@EinarRoed it may also be written.
if first.policy_no then seq = 0;
seq + 1;
Nope, just a typo. Could do:
data want; set have; by policy_no; retain want; want=ifn(first.policy_no,1,sum(want,1)); run;
Thats probably easier.
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