On Mon, 22 Oct 2007, Max Manfrin wrote:
Can anybody explain me what does it mean "Estimated effects may be
unbalanced", and what does it imply for the anova analysis?
The help page does! I suspect you intended to use factors, and have not
done so, and also that you did not intend to replicate res.
Try
D <- expand.grid(A=factor(c(0,1,2,3)),B=factor(c(0,1)),C=factor(c(0,1)))
aov(rnorm(16) ~ A * B * C, data = D)
Here a case example of what I get.
D<-expand.grid(A=c(0,1,2,3),B=c(0,1),C=c(0,1),res=c(runif(30,0,1)))
aov(res~A*B*C,data=D)
Call:
aov(formula = res ~ A * B * C, data = D)
Terms:
A B C A:B A:C B:C A:B:C
Residuals
Sum of Squares 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
0.00000 50.93402
Deg. of Freedom 1 1 1 1 1 1
1 472
Residual standard error: 0.3284982
Estimated effects may be unbalanced
Thanks in advance
PS: > R.Version()
$platform
[1] "powerpc-apple-darwin8.10.1"
$arch
[1] "powerpc"
$os
[1] "darwin8.10.1"
$system
[1] "powerpc, darwin8.10.1"
$status
[1] ""
$major
[1] "2"
$minor
[1] "6.0"
$year
[1] "2007"
$month
[1] "10"
$day
[1] "03"
$`svn rev`
[1] "43063"
$language
[1] "R"
$version.string
[1] "R version 2.6.0 (2007-10-03)"
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Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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