[R] random error with lme for repeated measures anova

[Mark Difford]

Hi Jean-Pierre,

A general comment is that I think you need to think more carefully about
what you are trying to get out of your analysis. The random effects
structure you are aiming for could be stretching your data a little thin.

It might be a good idea to read through the archives of the
R-sig-mixed-models mailing list

https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models

This should give you a better idea of some of the issues involved.

If you can't source the source (P&B) then there are other documents that
might help. You could begin by locationing the directory where nlme package
is installed and looking at the scripts in the scripts subdirectory. These
are from P&B.

Baayen has the following draft document on his website. Though DRAFT'ed all
over the place, it is well worth a read, even if you are not interested in
linguistic analysis. I think it has now been published by Cambridge UP.

http://www.ualberta.ca/~baayen/publications/baayenCUPstats.pdf

Paul Bliese's document (Multilevel Modeling in R) also has some useful
sections (find it under the contributed documents section on CRAN).

HTH, Mark.


Jean-Pierre Bresciani wrote:
> 
> Hi,
> 
> what is the appropriate syntax to get the random error correct when
> performing repeated measures anova with 'lme'.
> 
> let's say i have 3 independent variables, with 'aov', i would write
> something like: aov(dep_var~(indep_var1*indep_var2*indep_var3) +
> Error(subject/(indep_var1*indep_var2*indep_var3)).
> 
> With 'lme' however, i can't find the right formula. i tried things like:
> lme(dep_var~(indep_var1*indep_var2*indep_var3), random = ~1|subject) or
> nesting my independent variables in 'subject', but those are obviously
> wrong with my design.
> 
> i'm quite clueless (and i haven't found any convincing piece of
> information about how to correctly use 'lme' or 'lmer'). So, any advice
> along that line is more than welcome.
> 
> JP 
> 

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