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From: Lindsay Banin <l.banin05_at_leeds.ac.uk>
Date: Thu, 10 Apr 2008 15:12:34 +0100


Subject: nls, step factor 0.000488281 reduced below 'minFactor' of 0.000976563

Hi there,
I'm trying to conduct nls regression using roughly the below code:

nls1 <- nls(y ~ a*(1-exp(-b*x^c)), start=list(a=a1,b=b1,c=c1)) I checked my start values by plotting the relationship etc. but I kept getting an error message saying maximum iterations exceeded. I have tried changing these start values, and I heeded advice from other threads and ammended my code to include :, control = list(maxiter = 500), trace=TRUE)).
Now I receive an error message saying "step factor 0.000488281 reduced below 'minFactor' of 0.000976563".

Any ideas?
Many thanks in anticipation,

LB



Lindsay Banin
School of Geography
University of Leeds
Leeds, LS2 9JT
UK
l.banin05_at_leeds.ac.uk


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