R help - Dec 2005 - M-estimator R function question

In the robust library of S+, it is possible to compute Rocke's
constrained M-estimator of scatter and location. Can't find anything
within R that does the same thing. Can someone tell me whether any package
exists for computing it?

Thanks.

	Rand Wilcox
        Professor
	Dept of Psychology
	University of Southern California
	Los Angeles, CA 90089-1061
        FAX: 213-746-9082

>>>>> "Rand" == Rand Wilcox <rwilcox at usc.edu>
>>>>>     on Fri, 02 Dec 2005 10:42:48 -0800 (PST) writes:
    Rand> In the robust library of S+, it is possible to compute
    Rand> Rocke's constrained M-estimator of scatter and
    Rand> location. Can't find anything within R that does the
    Rand> same thing. Can someone tell me whether any package
    Rand> exists for computing it?

I can't offhand.
There's the cov.rob functions in 'MASS' and the  'rrcov'
package
which do similar (better ? :-) things.

Note that for a few weeks now, there's the R-SIG-robust mailing
list [--> CC to there],  on which we plan to talk about and coordinate the
development of more robust methods for R --- as an offspring
from the Treviso workshop "Robustness and R".

Unfortunately, some things (e.g. workshop "minutes") are still a
bit in a waiting state.

One thing we'd be very interested is the OGK estimator of
Maronna and Zamar (JASA, 2002).  Unfortunately, there, too, some
of the authors sold their code exclusively to Insightful (the
S-plus company).

    Rand> Thanks.

You're welcome.

    Rand> 	Rand Wilcox Professor Dept of Psychology
    Rand> University of Southern California Los Angeles, CA
    Rand> 90089-1061 FAX: 213-746-9082

Martin Maechler, ETH Zurich