[R] AOV with repeated measures

From: Christian Landry <clandry_at_fas.harvard.edu>
Date: Thu 27 Oct 2005 - 05:09:58 EST


Dear R user,

I have a question on using R to analyze data with repeated measurements. I have 2 species with several strains (12) per species, each of which has been measured twice with for a given trait. No particular covariance, just two measures. Now I want to analyze the data with an ANOVA (aov) considering these repeated measures to get the MSq and SSq for the species and strain level. I would like to know how to write the ANOVA model in R. I have done the following:

aov(trait ~ species + strain/replicate)

Is it accurate?

Thanks a lot,

Christian



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