[R] Type III Sum of Squares

[Prof Brian D Ripley]

On Fri, 1 Mar 2002, [iso-8859-1] Sébastien Plante wrote:

> Hi,
>
> When doing a two-ways anova in R and comparing my same results with an SPSS
> output, I noticed that R calculated type I Sum of Squares. Is it possible to
> use Type III Sum of Squares?

Yes, but we don't tell you how to avoid leading you into a mire. See
http://www.stats.ox.ac.uk/pub/MASS3/Exegeses.pdf.

Most of the time drop1() does what people are using `Type III' for.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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