Hi, you should give more details of your problem (at least some output, as Peter Daalgard says). But you are probably asking for something like this: http://www.r-bloggers.com/anova-%E2%80%93-type-iiiiii-ss-explained/ or many other webpages that you may find if you Google or R-seek with keywords like "anova" "type i", "type iii", etc.
If you have within-subjects factors, the same commands will not give you a sensible result. If you want to use Anova() for that, you should use the arguments "idata", "idesign", etc., as explained in the help page of that function, or in the web appendix to the "CAR" book: http://socserv.mcmaster.ca/jfox/Books/Companion/appendix/Appendix-Multivariate-Linear-Models.pdf Helios De Rosario -- Helios de Rosario Martínez Researcher >>> El día 20/05/2012 a las 0:58, jacaranda tree <myjacara...@yahoo.com> escribió: > Hi all, > I have been struggling with ANOVAs on R. I am new to R, so I created a > simple data frame, and I do some analyses on R just to learn R and then check > them on SPSS to make sure that I am doing fine. Here is the problem that I've > run into: > > when we use the aov function, it uses SS Type I as default (on SPSS it is > Type III). Then I used the Anova function under cars package using the > command: > > mod <- lm(DV > ~ IV1*IV2, data = mydata, > contrasts=list(IV1=contr.sum, > IV2=contr.sum)) > Anova(mod, type=”3”) > > Above, both of my IVs are between-SS variables. But still, results from this > model do not match the results from SPSS (I have to say they are not too > different either). But I was wondering if I am doing something wrong. If what > I am doing is okay, then my next question is can I use the same set of > commands (for Anova function) if one of my IVs was within-SS and the other IV > was between-SS? > > > Thank you very much! INSTITUTO DE BIOMECÁNICA DE VALENCIA Universidad Politécnica de Valencia • Edificio 9C Camino de Vera s/n • 46022 VALENCIA (ESPAÑA) Tel. +34 96 387 91 60 • Fax +34 96 387 91 69 www.ibv.org Antes de imprimir este e-mail piense bien si es necesario hacerlo. En cumplimiento de la Ley Orgánica 15/1999 reguladora de la Protección de Datos de Carácter Personal, le informamos de que el presente mensaje contiene información confidencial, siendo para uso exclusivo del destinatario arriba indicado. En caso de no ser usted el destinatario del mismo le informamos que su recepción no le autoriza a su divulgación o reproducción por cualquier medio, debiendo destruirlo de inmediato, rogándole lo notifique al remitente. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
