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 [EMAIL PROTECTED] ********************** ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
