[R] Nonlinear regression

[Spencer Graves]

      Let's not be so hard on SAS.  I thought it was marvelous when I 
first used it over 30 years ago. 

      Spencer Graves

Bill.Venables at csiro.au wrote:
> ?nls
>
> (I always knew SAS *is* a DUD, but never that it has a DUD too...) 
>
>
> Bill Venables
> CSIRO Laboratories
> PO Box 120, Cleveland, 4163
> AUSTRALIA
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>
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
> On Behalf Of LXu at hnrg.com
> Sent: Wednesday, 21 May 2008 9:23 AM
> To: r-help at r-project.org
> Subject: [R] Nonlinear regression
>
> Could someone help me on the following:
> SAS has DUD (Does not Use Derivatives) for nonlinear regression.
>
> Does "R" has a similar capability?
>
> I am not good at derivatives and may get my derivative wrong before 
> feeding it to a nonlinear regression procedure.
>
> Any help would be much appreciated. 
>
> Liu
> Hancock Forest Management NZ
> Tokoroa, New Zealand 
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> lxu at hnrg.com
>
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