[R] nonlinear regression with M estimation

Ruei-Che Liu rl241 at columbia.edu
Mon Jul 5 18:08:58 CEST 2004

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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