07-10-2013 05:58 PM
I am in urgent need of someone to help me with some logic where if a subject is a part of the study from week1-week 28 and has received product x1 and x2. But if I am interested in finding if that subject does not have product x1 at week 12 or week 14 then need to drop that week and move on. Basically I need a counter to see if that product is given between week 1 to week 28 and if that product is not given in certain week then drop that week. How I can do this?