[R] Segmented Error Message

Alexander Sherman arsherma at eco.umass.edu
Tue Apr 26 21:47:50 CEST 2011

Hi All,

I am trying to use the segmented package to determine the break point  
in a simple quadratic regression.  I am receiving the error "(Some)  
estimated psi out of range"

I searched the message board and found others that have had the same  
issue, but no clear solutions have been provided.  Does anyone know of  
a solution to this error?

Here is my model and segmented code.

aclmfit<-lm(caliper~TreeAge + TreeAge2, data=ac2)

ac.seg<-segmented.lm(aclmfit,seg.Z=~TreeAge + TreeAge2,  
psi=list(TreeAge=c(3,4,5), TreeAge2=c(0,16,25)))

Thanks for the help,


Alexander R. Sherman
ISA Certified Arborist NE-6472A
Research Assistant
Department of Environmental Conservation
University of Massachusetts
Room 225
160 Holdsworth Way
Amherst, MA 01003

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