[R] Covariates in LME

From: Aberg Carl <kristoffer.aberg_at_epfl.ch>
Date: Thu, 27 Mar 2008 13:05:25 +0100


Hi,
Im using lme to calculate a mixed factors ANOVA according to:

px_anova = anova(lme(dep~music*time*group, random = ~1|id, data = px_data))

where

dep is a threshold,
time is a repeated measures variable (2 levels) group is a between subjects variable (2 levels) id is a random factor (subject id)
music is a between subjects variable (2 levels) indicating if a person has a musical experience, or not

Musical experience is now decided by categorizing depending on the number of years practicing playing an instrument.

I would like to use the years of playing an instrument as a covariate instead of creating categories.

How can I do this in a simple way?

Thanks and have a nice day!

Kristoffer



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