R help - Apr 2002 - Repeated aov residuals

Hello,

Are there any access functions to the various residual variables that should 
result from a repeated measures ANOVA ? MyAOVObject$residuals does not exist, 
and simply printing MyAOVObject gives a very long print of all fields in the 
result list, many of which I can't see what they are exactly : 
$error.qr$qraux, for instance.

What I would like basically is to inspect those residuals as to sphericity 
for instance.

I'd be curious to know how other R users proceed for checking ANOVA 
assumptions in the repeated measures case.

Thanks a lot for your help,

Y. Noel
Dpt. of Psychology
U. of Lille 3
FRANCE
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On Tue, 2 Apr 2002, Yvonnick NOEL wrote:
> Are there any access functions to the various residual variables that
should
> result from a repeated measures ANOVA ? MyAOVObject$residuals does not
exist,
> and simply printing MyAOVObject gives a very long print of all fields in
the
> result list, many of which I can't see what they are exactly :
> $error.qr$qraux, for instance.
Do this by stratum: see e.g. the MASS script which contains

oats.aov <- aov(Y ~ Nf*V + Error(B/V), data = oats, qr = T)
plot(fitted(oats.aov[[4]]), studres(oats.aov[[4]]))
abline(h=0, lty=2)
oats.pr <- proj(oats.aov)
qqnorm(oats.pr[[4]][,"Residuals"], ylab="Stratum 4
residuals")
qqline(oats.pr[[4]][,"Residuals"])

You may need the book to understand the context, but a multi-stratum aov
object is a list of aov objects, one for each stratum.

-- 
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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