[R] MANOVA extension of paired t-test?

[Prof Brian Ripley]

On Thu, 24 Jan 2002, Stewart Schultz wrote:

> >It's not true, indeed false in almost every detail.  manova performs no
> >tests at all.  summary.manova uses multivariate tests in an ANOVA table,
> >but they are not t-tests and there is an experimental design, not one or
> >two samples.
> >
> >I am at loss as to what you meant!  If you want to test the overall mean
> >vector in such a design, you can do so by specifying intercept=TRUE in
> >summary.manova.
>
> What is the original manova() statement in such a case?  In other words,
> one has several variables, and the desire is to test whether the mean of
> each is zero (the "treatment" has been subsumed by the definition of the
> variable, which is a before-after difference).  manova(Y~rep(0,nrow(Y))) is
> the intuitive choice, but doesn't work.

manova(Y ~ 1) specifies an overall mean, if that is what you want.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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