From: <ekhous_at_po-box.mcgill.ca>

Date: Wed 20 Jul 2005 - 11:57:08 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Jul 20 12:01:49 2005

Date: Wed 20 Jul 2005 - 11:57:08 EST

res<-nls(y~(a+b*x)*w+(c+d*x)*(1-w),start=list(a=1,b=0.3,c=-1,d=-0.2,w=0.5))

Error in nlsModel(formula, mf, start) : singular gradient matrix at initial parameter estimates

What am I doing wrong? I tried many different parameter values to no avail.
Thank you so much in advance,

Sincerely,

Eugene

McGill University

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Jul 20 12:01:49 2005

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