[R] How to code repeated measures interaction in lmer?
René Mayer
mayer at psychologie.tu-dresden.de
Thu May 6 12:55:22 CEST 2010
Dear Everybody:
I want to test an interaction of two repeated measures in lmer()
I've response times (Y) from N subjects with two within-subject-factors.
aov(Y ~ A*B + Error(subjects/A*B), ...) shows an insigificant
interaction p(A:B) = .35
now lmer()
lm1 = lmer(Y ~ 1+A+B+(1+A*B|subjects), ...)
lm2 = lmer(Y ~ 1+A*B+(1+A*B|subjects), ...)
p(A:B) = anova(lm1,lm2)
is this right?
and when do I have to write
lm1 = lmer(Y ~ 1+A+B+(1|subjects)+(1|subjects:A:B), ...)
lm2 = lmer(Y ~ 1+A*B+(1|subjects)+(1|subjects:A:B), ...)
p(A:B) = anova(lm1,lm2)
?
many thanks in advance,
René
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