Hi, I have been trying glht() from multcomp package
and contrast() from contrast package to test a
contrast that I am interested in.
With the following simulated dataset (fixed effect
type with 3 levels (b, m, t), and random effect
batch of 4 levels, a randomized block design with
interaction),
With the example you provided, it seems both glht() and contrast()
work fine.
Based on my limited experience with contrast(), if you encounter such
an error message you just mentioned, check
dat.lme$apVar
You might see something like this
[1] Non-positive definite approximate
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