Interaction
On Mon, Oct 29, 2012 at 7:09 PM, Jeff Newmiller
<jdnewmil at dcn.davis.ca.us> wrote:
I thought addition was commutative. I am puzzled by your question.
1. This is not addition. These are model fomulae. 2, The model fitting function is unspecified by the OP. What is it? lm()? 3. In general, the coefficients should not depend on the order of the coefficients, However, inference will (sums of squares, etc.). Cheers, Bert
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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 Ci?ncias Exatas Departamento de Estat?stica Fone: (43) 3371-4346
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm