I don't know of any straightforward method in SAS. I would guess that it could be done in IML with sufficient programming skill, or maybe even in NLMIXED. I would be very curious to know others' opinions.
Steve Denham
Ready to join fellow brilliant minds for the SAS Hackathon?
Build your skills. Make connections. Enjoy creative freedom. Maybe change the world. Registration is now open through August 30th. Visit the SAS Hackathon homepage.