[R] "Estimate effects may be unbalanced" in aov()

[Max Manfrin]

Can anybody explain me what does it mean "Estimated effects may be unbalanced", and what does it imply for the anova analysis?

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:


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)"


--------------------------------------------------------------------
Max MANFRIN                                 Tel.: +32 (0)2 650 3168
IRIDIA - CoDE, CP 194/6                     Fax.: +32 (0)2 650 2715
Université Libre de Bruxelles
Av. F. D. Roosevelt, 50
1050 Brussels                             Email: [EMAIL PROTECTED]
BELGIUM                      WWW: http://iridia.ulb.ac.be/~mmanfrin

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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

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