[R] reading lmer table

Mark Difford mark_difford at yahoo.co.uk
Thu Aug 19 10:06:04 CEST 2010


Hi Nicola,

>> In few word: does this row indicate a global effect of the predictor
>> 'cat' 
>> or a more specific passage?

It indicates a more specific passage.  Use anova(m7) for global/omnibus.
Check this for yourself by fitting the model with different contrasts. The
default "contrasts" in R are treatment contrasts.

##
m7 <- lmer(log.second ~ Cond + cat + (1|subjID) + (1|Code), data = march.f, 
                        contrasts=list(Cond=contr.treatment,
cat=contr.treatment))
m7s <- lmer(log.second ~ Cond + cat + (1|subjID) + (1|Code), data = march.f, 
                        contrasts=list(Cond=contr.sum, cat=contr.sum))
summary(m7)
summary(m7s)
anova(m7)
anova(m7s)

Regards, Mark.
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