Study ID | Drug1 | Drug2 | Drug3 |
00001 | 1 | 0 | 0 |
00001 | 0 | 0 | 1 |
Hello,
I just started using SAS again and I have yet to refresh my memory.
I'm currently investigating 3 drugs - patients are only supposed to be prescribed to only 1 drug.
However, some patients received more than 1 drug (as depicted in the table above) and I want to delete these specific individuals from the data.
Any codes to identify and delete these individuals? Any advice/help would be appreciated.
Hi novinosrin,
Study_ID in this case would be the patient_id.
Maybe this:
data have;
format studyid z5.;
input studyid drug1-drug3;
datalines;
00001 1 0 0
00001 0 0 1
00002 0 1 0
;
run;
data want;
set have;
by studyid;
if first.studyid then
rx_total=0;
rx_total+sum(of drug:);
if last.studyid and rx_total=1 then
output;
drop rx_total;
run;
assumes only one drug can be 1 for any given observation.
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