On Mar 23, 2013, at 4:06 AM, Vanni Rovera wrote: > Hi there > > I don't know if this is the right place to do such a question, but > nonetheless I try.
It is very much not the correct place to post this. There is no Mac-spcific content and there is a mixed-models mailing list wher ethis would be completely appropriate. You should do the necessary subscription and reading of their FAQ before re-posting. http://www.r-project.org/mail.html https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models http://glmm.wikidot.com/faq > I'm trying to understand how to use the function lmer in > order to do a between- and within-factors ANOVA, but without any success. I > know about the usage of the function aov, but this holds only for balanced > designs; its documentation say to use lme function (package nlme) for > unbalanced designs. Furthermore the lmer function (package lme4) is an > evolution of lme, so I wish to use this last function in order to perform > my ANOVA. But I'm not able to understand how to do this. > > More precisely, imagine you have a dependent variable DV and four > independent variables IV1, IV2, IV3, IV4, where IV1, IV2 are > between-factors and IV3, IV4 are within-factors. Moreover you have a > variable called Subject in order to identify the subject on which > measurements are done (like for example this dataset: > http://personality-project.org/r/datasets/R.appendix5.data). If I use the > aov function, my between- and within-factors ANOVA would stand as follows: > > aov(DV~(IV1*IV2*IV3*IV4)+Error(Subject/(IV3*IV4))). > > Now can you write me the precise syntax in order to obtain the same result > with the lmer function? Thanks a lot in advance, and forgive me in the case > this topic is inappropriate with this mailing list. > > > > *Additional details:* The problem is that no one seems to be interested in > explain the relations of 'within-factor' and 'between-factor' concepts with > those of 'fixed-effect' and 'random-effect'. Textbooks and papers about > ANOVA talk about between and within factors, while documentations and > papers about lmer function talk about mixed-effects models, i.e. they talk > fixed and random effects, without mentioning between and within factors. > Thus I am not able to understand the relations between the two, since I > think they are completely uncorrelated each others. > > [[alternative HTML version deleted]] > > _______________________________________________ > R-SIG-Mac mailing list > [email protected] > https://stat.ethz.ch/mailman/listinfo/r-sig-mac David Winsemius Alameda, CA, USA _______________________________________________ R-SIG-Mac mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-mac
