I have a data set like as follows
PatientID year adherence
1 1 0
1 2 1
1 3 1
2 1 1
2 2 1
3 1 1
3 2 1
3 3 0
3 4 1
What i want is to create a new variable that will give cumulative adherence at year "i". Thus the data with a new variable will look like
PatientID year adherence cumulativeAdherence
1 1 0 0
1 2 1 1
1 3 1 2
2 1 1 1
2 2 1 2
3 1 1 1
3 2 1 2
3 3 0 2
3 4 1 3
Couldn't you just use something like:
data want;
set have;
by PatientID;
if first.PatientID then cumulativeAdherence=adherence;
else cumulativeAdherence+adherence;
run;
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