[R] Repeates Measures MANOVA for Time*Treatment Interactions

Peter Dalgaard p.dalgaard at biostat.ku.dk
Tue Nov 15 20:08:53 CET 2005


Peter Dalgaard <p.dalgaard at biostat.ku.dk> writes:

> No... idata is the *intra*-block structure, so it should just be your
> five times. I'm somewhat baffled that you're getting away with

To clarify: Your five times, if anything. the default is a dataframe
containing the single vector 1:p where p is the number of columns.

This allows you to fit simple polynomials in time and test them for
interaction with treatment, etc., but of course it requires that the
times are equispaced, so if they are not, then you should use
(say) idata=data.frame(time=c(0,3,6,9,12,18,24))

<snip rest>
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   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
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~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907




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