On Apr 1, 2013 1:10 AM, "qi A" <send2aqi@gmail.com> wrote:
>
> Hi, All
>
> SAS has DUD (Does not Use Derivatives)/Secant Method for nonlinear
> regression, does R offer this option for nonlinear regression?
>
> I have read the helpfile for nls() and could not find such option, any
> suggestion?
>

nelder-mead is default algorithm in optim. It does not use derivatives. dud
is from same generation, but John Nash recommended N-M method.

Pj

> Thanks,
>
> Derek
>
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