Dear John
?ordered
will help you.
Regards,
Christoph Buser
--------------------------------------------------------------
Christoph Buser <buser at stat.math.ethz.ch>
Seminar fuer Statistik, LEO C13
ETH Zurich 8092 Zurich SWITZERLAND
phone: x-41-44-632-4673 fax: 632-1228
http://stat.ethz.ch/~buser/
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John Vokey writes:
> useRs,
> A no doubt simple question, but I am baffled. Indeed, I think I
> once knew the answer, but can't recover it. The default contrasts
> for aov (and lm, and...) are contr.treatment and contr.poly for
> unordered and ordered factors, respectively. But, how does one
> invoke the latter? That is, in a data.frame, how does one indicate
> that a factor is an *ordered* factor such that contr.poly is invoked
> in the aov or lm call?
> --
> Please avoid sending me Word or PowerPoint attachments.
> See <http://www.gnu.org/philosophy/no-word-attachments.html>
>
> -Dr. John R. Vokey
>
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