05-07-2013 11:08 PM
can anyone help me find a way to calculate the proportion of subjects in trt1 per visit receiving placebo from a dataset containing variables ..usubjid, trt1,trt2 .avisit .avisitn .pbo and drug.
i am supposed to plot this proportion as another graph. so i need i need to add this proportion data to the main dataset in order to validate.
please suggest this is urgent . i tried with merge it is not working for some reason. can anyone guide me with proc sql.
05-07-2013 11:48 PM
Something like this?
create table temp as
select a.usubjid, a.avisitn, count1/count2 as pct
(select usubjid, avisitn, count(usubjid) as count2 from dataset where trt1 ne '' group by avisitn ) a
(select usubjid,avisitn,count(usubjid) as count1 from dataset where trt1 ne '' and drug='PLACEBO' group by avisitn) b
then you can merge with original with usubjid avisitn....