Hi,
Sorry for this one as its pretty basic but I've taken a look for info and
couldn't find any...
My question is, does the order of main effect terms in a model specification
have any impact on the model R fits or not. (in particular when using lm).
ie
Can A~X+Y+Z lead to different results to A~Z+Y+X, and if so in what
circumstances, and how much should I worry about it?
I believe this is an implementation detail as it depends on the way the
fitting algorithm works, but it would be great to have a few lines to plug
this gap in my knowledge...
Many thanks,
Oliver
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