Message-ID: <Pine.LNX.4.21.0005091020510.751-100000@boromir.ci.tuwien.ac.at>
Date: 2000-05-09T08:29:04Z
From: Torsten Hothorn
Subject: using MANOVA in R
In-Reply-To: <x2og6g87f6.fsf@blueberry.kubism.ku.dk>
On 9 May 2000, Peter Dalgaard BSA wrote:
> Prof Brian D Ripley <ripley at stats.ox.ac.uk> writes:
>
> > Not really any of it! multilm fits multivariate linear models and does
> > Hotelling T^2 tests. It does not group terms for AOV, and I think is only
> > applicable for continuous variates (not factor explantory variables).
> > Certainly the help and examples only discuss that case.
>
> Had a closer look. The factor expl.var. would seem to be there
> case-wise, so you can build the models, but Wilk's Lambda and friends
> are absent, so you cannot (easily) do multi-df model reduction tests.
> However, it's no too far off. Is the author planning to develop it
> further?
Now it is my turn, I think :-)
1) "multilm" is on my list, but there are some theoretical problems
(e.g. is the use of Moore-Penrose numerically appropriate ?) Any help by
other distributors would be very welcome!
2) "multilm" was written for the use of the stabilized multivariate tests
by Laeuter and Kropf, T^2 is only a by-product. Therefore the
documentation is heavily biased on this.
3) I do think that one can take factors as design variables (there is an
Iris example, I think).
4) I just had my third move this year (this time to Erlangen, Bavaria), so
time is a problem too :-)
Torsten
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