Boy, I could spend hours on this one.  I think you clued into my earlier posts about equation based Rx ( and easy ability to tweak these relationships graphically).  SMS Advanced has a basic equation builder (the sole reason I changed this year) - Apex must have this in the future (or their cloud partners must have this ability).


See this thread where I posted my population rate equations (either 4th order or second order equations would work).

http://talk.newagtalk.com/forums/thread-view.asp?tid=452947&mid=3675857#M3675857

 A better  model maybe a system of Boltzmann (sigmoidal) relationships.  Email in my profile is good.  I think we see the same trap in relying on other's analysis - esp if they are the ones selling you inputs.