I have a list of variables d1-dnth and I'm looking for a quick solution to
computing the average of d1-d5, d6-d10, etc. AND and also compute the
average of d1-d5, d2-d6, d3-d7, etc. Then compare the differences in
averages between the two methods.
I've played around with it but now i'm resorting to SAS-L hoping to get
someone to point me in the right direction.