Mixed effects model with a distance matrix as a random effect

Hi Roey,
do you mean as Z-matrix or as var-covar relationship matrix? For the 
later see lmekin (coxme package). There you can specify a similarity 
matrix (K) for a random effect (u):
u ~ N(0, sigma_u^2 K)

or one of the following packages: regress, rrBLUP, EMMA 
(http://mouse.cs.ucla.edu/emma/)

Bests
Jonas

Hi,
I'm trying to build a mixed-effects model in which I'd like to include
either a distance matrix as a random effect.
The troubles I've had are that function lmer() in package lme4 only accepts a data frame column as a random factor and not a distance matrix.

Is there a way around it?

Thanks in advance
Roey


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 Jonas Klasen
 PhD student
 Genome Plasticity and Computational Genetics
 Max Planck Institute for Plant Breeding Research