Dear all,

I am trying to build a mixed model to do association mapping of QTL.
Basically I want to know if a marker is correlated with a trait. I know
there are some packages that do this type of analysis like GenABEL, but I
need more flexibility to modify the model to include, for example, the
genotype by environment interaction.

I would like to include the matrix defining the familial relationships
between individuals estimated with molecular markers (K) to the model

lmer(trait ~ marker + (1|individual), data)

I have not figured out how to do it. The statisticians in my institute do
not use R, so they can't help me in setting this up.

Any help will be very much appreciated.

Marc.

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