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Lindsay Banin l.banin05 at leeds.ac.uk
Thu Apr 10 16:12:34 CEST 2008

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

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,


Lindsay Banin
School of Geography
University of Leeds
Leeds, LS2 9JT
l.banin05 at leeds.ac.uk

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