search for: bacon&watts

...imoto/Abe or the earlier version from 1985 (Ohtani/Katayama, Economic Studies Quarterly; assuming as a transition path a polynomial of order 1). I found an idea for using nls here: http://www.biostat.wustl.edu/archives/html/s-news/2000-04/msg00223.html. Unfortunately it's based on the 1971 Bacon&Watts model, which does not allow obtaining explicitly both start- and end-point of the transition phase. If anyone stumbled across such a function or has suggestions on how to do it, I would greatly appreciate hearing about them. Thanks so much Ben Volland