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curleft
2006 Oct 20
2
Generating start values for nls
...rogrammatically generate
parameter start values for the model y~(a*exp(b*x)+c*exp(d*x)) in R.
I've scoured the help files and archives for nls() and similar searches,
and have read Fox 2002 - the best advice has been to make estimates from
a priori knowledge of the data. However, in the Matlab CurveFit tool,
reliable start values are somehow estimated 'heuristically', as is
claimed in their help files. Is there a similar R routine than may
produce reasonable start values?
Many thanks,
Paul Brewin
Paul E Brewin (PhD)
Center for Research in Biological Systems
University of California San...