Hello,
Suppose i have such dataset :
date id res sumres
1 a 10
1 a 15
1 a 10 35
2 a 12
2 a 8
2 a 10 30
1 b 10
1 b 17
1 b 12 39
;
I need to calculate these sumres (35, 30, 39....) in a new dataset which are for id=a and date=1, for id=a and date=2, id=b and date=1, id=b=2 and so on... i have dates from 1...30.
its probably a loop, if first.date=....do;..but cant figure it out.
anyone knows how to do it? i'd be immesely grateful.
cheers,
M
If your data are EXACTLY as shown, and you really only want the sumres calculation to be non-missing for the last record in each set, then it is easy. I don't have access to SAS to test the following code at the moment, but it should give you enough of an idea to solve your problem.
data want (drop=calculation);
set have;
by id date;
if first.date then calculation=res;
else calculation+res;
if last.date then sumres=calculation;
run;
If your data are EXACTLY as shown, and you really only want the sumres calculation to be non-missing for the last record in each set, then it is easy. I don't have access to SAS to test the following code at the moment, but it should give you enough of an idea to solve your problem.
data want (drop=calculation);
set have;
by id date;
if first.date then calculation=res;
else calculation+res;
if last.date then sumres=calculation;
run;
art297, thank you for a quick reply - you're a star! i tried it before but missed out the ' if last.date' part
Are you ready for the spotlight? We're accepting content ideas for SAS Innovate 2025 to be held May 6-9 in Orlando, FL. The call is open until September 25. Read more here about why you should contribute and what is in it for you!
Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video.
Find more tutorials on the SAS Users YouTube channel.