[R] Generating start values for nls

[Douglas Bates]

On 10/19/06, Paul Brewin <pebrewin at sdsc.edu> 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?

?SSbiexp

or

example(SSbiexp)