I have a common reference design with a couple of factors. I was planning on using model.matrix to set up the design matrix. Do I need to use an intercept term when using model.matrix? Thanks, Sean

> I have a common reference design with a couple of factors. I was > planning on using model.matrix to set up the design matrix. Do I need > to use an intercept term when using model.matrix? Makes no difference. You can do it either way. Gordon > Thanks, > Sean