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Thanks!! I have already figured it out! Will share the code with everybody^^ data b; set a; by id ; retain bltime; if first.id then bltime=0; if amt^=0 then bltime=tsfd; tad=tsfd-bltime; run; ID tsfd dose bltime tad 1 0 50 0...

Can anybody help me to solve this problem? Or give me any hint!? I really appreciate it!:)

Because this is multiple dosing(for example, ID=1, dosing 50 when tsfd=0 and dosing 100 when tsfd=10), I want to create a new variable to calculte relative time (consider every dosing time as baseline), so when tsfd=0 and tsfd=10, tad=0 So we have tad: 0 (dosing) 1 5 8 0 (dosing twice) 2 5...

Hi everyone, I have a question about time issue. The original dataset has three column: ID, tsfd(time since first dose), dose(for ID=1, dosing twice,50 at time=0 and 100 at time=10). Now I want to add another column called "tad"(time after last dose) I want output like this: ID tsfd...

Thanks a lot! Actually, that's the way I choose to use in this real case finally!:)

Thanks a lot!! It's very helpful:)

Hi everyone, I have a question about creating duplicate records (but different times) using SAS. my questions is: If I have a dataset like days startdate stopdate 2 01/02/2009 03/02/2009 3 05/02/2009 08/02/2009 5 01/03/2009 06/03/2009 I want to duplicate the first record two times and...