[R] Interaction

[Jeff Newmiller]

I thought addition was commutative. I am puzzled by your question.
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Sent from my phone. Please excuse my brevity.

Silvano Cesar da Costa <silvano at uel.br> wrote:

>Hi,
>
>I'm fitting a model with 3 variables: A, B and SNP.
>The response variable is Y.
>
>I would like fit the following model, in this order:
>
>Y ~ A + B + A*B + SNP
>
>In general, the R sets of the form:
>
>Y ~ A + B + SNP + A*B
>
>How do this?
>
>
>---------------------------------------------
>Silvano Cesar da Costa
>
>Universidade Estadual de Londrina
>Centro de Ciências Exatas
>Departamento de Estatística
>
>Fone: (43) 3371-4346
>
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