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2010 Dec 26
2
Doing a mixed-ANOVA after accounting for a covariate
...I noticed for handling covariates (i.e. ANCOVA, including
the ones in Faraway's "Practical regression and anova using r") use lm(),
but this doesn't handle repeated-measures.
I thought of a solution in the form of first running a regression on the
covariate:
> cov.accnt = lm (myMeasure ~ myCovMeasure, data=dat)
and then run the aov() on the residuals:
> m.aov = aov (cov.accnt$residuals ~ withinVar*betweenVar +
Error(subj/withinVar, data=dat)
Does it seem to be a valid answer to my problem?
Is there an existing function that can do this (perhaps more appropriately)?
Thank y...