[R] nonlinear regression with M estimation

[roger koenker]

the package nlrq does median nonlinear regression...  among other 
things.



url:	www.econ.uiuc.edu/~roger        	Roger Koenker
email	rkoenker at uiuc.edu			Department of Economics
vox: 	217-333-4558				University of Illinois
fax:   	217-244-6678				Champaign, IL 61820

On Jul 5, 2004, at 11:08 AM, Ruei-Che Liu wrote:

> Hi All,
>   Could any one tells me if R or S has the capacity to fit nonlinear 
> regression with Huber's M estimation? Any suggestion is appreciated. I 
> was
> aware of 'rlm' in MASS library for robust linear regression and 'nls' 
> for nonlinear least squares regression, but did not seem to be able to 
> find robust non-linear regression function.
>
>   Thanks and regards,
>
>   Ray Liu
>
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