SPSS N-way AN?OVA -> R ? (was [R] Unbalanced ANOVA in R?)
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 ns?
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 terminology.
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 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._