Divide column by reference point with conditions
Hi. I have a problem I can't get my head around. I am trying to create a new column which consists of another column divided by a reference point, but the problem is I have some conditions to include.For simplicity I have added a generated datafile which I will refer to. What I want to do is to take column Z and divide it by Z|X=c within each Y-group. The Y-groups are as you can tell not the same ...