Kjetil Kjernsmo <kjekje <at> ifi.uio.no> writes:
>
> All,
>
> I have just returned to R after a decade of absence, and it is good to
> see that R has become such a great success! I'm trying to bring Design
> of Experiments into some aspects of software performance evaluation, and
> to teach myself that, I picked up "Experiments: Planning, Analysis and
> Optimization" by Wu and Hamada. I try to reproduce an analysis in the
> book using lm, but have to conclude I don't understand what lm does in
> this context, even though I end up at the desired result. I'm currently
> using R 2.15.2 on a recent Fedora system, but I get the same result on
> Debian Wheezy and Debian Squeeze. I think the discussion below can be
> followed without having the book at hand though.
Just a quick thought (sorry for removing context): what happens if
you use sum-to-zero contrasts throughout, i.e. options(contrasts=c("contr.sum",
"contr.poly")) ... ?
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