[R] ANOVA 1 too few degrees of freedom

[Rovinpiper]

Please read the first two paragraphs of Details from ?formula

Ok, I just did.

So, If I understand this properly, the term Plot*Day would include both the
main effects of a and b and their second order interactions. So it could be
written Plot + Day + Plot:Day. 

The term Plot:Day includes only the second order interactions of Plot and
Day. 

So would that make this model redundant:

Rs ~ Plot + Day + Plot:Day

Since it includes the main effects of Plot and Day twice?

Thanks.

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