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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,


Lindsay Banin
School of Geography
University of Leeds
Leeds, LS2 9JT

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