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...lationships with the response?. However, the syntax for including multiple ?Z? and ?psi? (?starting values for the break-point(s)?) is not stated. Does anyone have any suggestions? Here is an example of correct code for detecting single breakpoint: model.seg<-segmented.glm(obj = model.glm, Z = predictor_variable, psi = 2 , it.max = 50) Thanks very much for your help. Matthew G. Betts, Ph.D. NB??Cooperative Fish and Wildlife Research Unit Faculty of Forestry and Environmental Management University of New Brunswick?? UNB Tweedale Centre Hugh John Flemming Forestry Complex 1350 Regent St., Fredericton,...