[R] contrasts for lmer model

[Kay Cichini]

.. i found this helpful thread:

http://r.789695.n4.nabble.com/Please-Post-Planned-Contrasts-Example-in-lme-nlme-td1598717.html#a1599031

m0<-lm(rich ~ gap*stage,data=richness)

cc<-contrast(m0,
a = list(stage="A",gap="0"),
b = list(stage="A",gap="1"))

m2<-lmer(rich~gap*stage+(1|site),family=poisson,data=richness)

# plug in matrix from contrast(m0)
summary(glht(m2, linfct = cc$X)) 

ok, this works fine - for each stage seperatly..

but what if i needed all 4 gap effects within each of the stages?
i think that then it may be needed to test "gap" within each stage
simultanously so that the p-values will be adjusted accordingly, isn't it?

is this possible? - if so, how would this be done?
anyone who can help with this..

best,
kay



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Kay Cichini
Postgraduate student
Institute of Botany
Univ. of Innsbruck
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