Originally Posted by FIRE'd@51
Maybe it can't be done, although I have to believe there are statistical methods that attempt to deal with the overlap problem, .... I started this thread with the hope that someone better versed in statistics than myself could opine on this subject.
OK, I'm certainly no expert with stats (I used to work with some PhD-level stats guys so I know I know don't much!), so I'll sit back and see if anyone with credentials can come up with some positive contributions. It's an interesting idea, I'm not sure if I think it can't be done because I don't know enough about stats, or because I do know enough.