[R] Robust nonlinear regression

[cstrato]

Dear R experts

This is a general question:
Does R have functions for nonlinear robust regression,
analogous to e.g. LTS?

Searching google I have found
1, an abstract to generalize LTS for nonlinear regression
models, see: http://smealsearch.psu.edu/1509.html
2, an AD-model builder, see: http://otter-rsch.com/admodel/cc1.html
but no mention of R/S

Thank you in advance
Best regards
Christian
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