SPSS N-way AN?OVA -> R ? (was [R] Unbalanced ANOVA in R?)
ripley at stats.ox.ac.uk
Fri Mar 8 14:59:14 CET 2002
On Fri, 8 Mar 2002, Fredrik Karlsson wrote:
> Thank you Professor Ripley for the quick and informative response.
> Being unable to choose a different textbook (even though I must admit
> that this SPSS obsession is starting to annoy me).
You could read a textbook on S/R which would explain what aov does. As I
understand it John Fox's car package is designed (amongst other things) to
make R easier for diehard SPSS users, so you ought to find that useful.
> I solved the problem though.
> I changed the subject for this post in order to change the topic into
> a more general one:
> What does aov() do and what does it NOT do?
> Prof. Ripley mentioned that you should use the lme() function for
> multistrata anova, so that's one. What else? (Realising that this is a
> question with an open set of answers).
No, for *unbalanced* multistrata anova (and that's the second time you
have quoted me out of context: please be more careful!). For balanced
desigms, aov() is the preferred tool. It's also general for unbalanced
fixed-effects models, but for some lm will be able to interpret.
> My impression is that what I am suppose do do in SPSS under some heading
> n-way anova, ancova, one-way glm or whatever is handled in S/R by aov()
> Does this mean you can use aov() to compare two groups with different
You can, but that's the job of t.test.
> Many open questions, I know, but the SPSS -> R translation is troubling
> for me.
It's troubling for us. SPSS is often grossly misleading in its
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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