[R] Estimated Effects Not Balanced
bgunter.4567 at gmail.com
Mon Aug 22 17:27:11 CEST 2016
"when I compute the anova R reports
that the Estimated Effects are Unbalanced"
It does *not* say this. It says that they **may** be unbalanced. They are not.
"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Mon, Aug 22, 2016 at 8:15 AM, Justin Thong <justinthong93 at gmail.com> wrote:
> Something does not make sense in R. It has to do with the question of
> balance and unbalance.
> I was under the impression that the design is balanced ie order does not
> effect the sums of squares. However, when I compute the anova R reports
> that the Estimated Effects are Unbalanced. I thought that when all
> combinations of levels of A and B have equal replications then the design
> is called balanced. But, R tends to think that when not all levels of A and
> levels of B have equal replication, then the "Estimated Effects are
> unbalanced".... Is this the same as the design being unbalanced? Because
> for the example below, where the error occured, the order does not matter
> (which make me think that the design is balanced).
> * aov(formula = y ~ A + B)*
> * A B Residuals*
> *Sum of Squares 0.872572 0.025604 16.805706*
> *Deg. of Freedom 1 2 10*
> *Residual standard error: 1.296368*
> *Estimated effects may be unbalanced*
> Yours sincerely,
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