On 10/19/06, Paul Brewin <[EMAIL PROTECTED]> wrote: > Dear R-listers, > > I would like to know if there is a way to programmatically 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?
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