[R] lme v. aov?

John Christie jc at or.psychology.dal.ca
Thu Nov 27 15:02:27 CET 2003

I am trying to understand better an analysis mean RT in various 
conditions in a within subjects design with the overall mean RT / 
subject as one of the factors.  LME seems to be the right way to do 
this. using something like m<- lme(rt~ a *b *subjectRT, random= 
~1|subject) and then anova(m,type = "marginal").  My understanding is 
that lme is an easy interface for dummy coding variables and doing a 
multiple regression (and that could be wrong).  But, what is aov doing 
in this instance? MANOVA?  I also haven't been able to find anything 
really useful on what to properly assign to  "random" in the lme 
formula.  For repeated measures the use above is always in the 

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