[R] using MANOVA in R

[Peter Dalgaard BSA]

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?

> norm is about multivariate normal data, no regressors, AFAIK.  Various
> people have pointed out the dangers of that: how often is iid on a 
> multivriate normal population appropriate?

Not often, but sometimes things fall apart into several homogeneous
groups and then it can be used as a building block. I've used
something like this for an RCT a while back back.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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