Hi;

I am running generalized linear mixed models (GLMMs) with the lmer function
from the lme4 package in R 2.6.2. My response variable is overdispersed, and
I would like (if possible) to run a negative binomial GLMM with lmer if
possible.  I saw a posting from November 15, 2007 which indicated that there
was a way to get lmer to work with negative binomial by assigning: family =
negative.binomial(theta=2.5) (or whatever value I would like to specify for
theta).  However I have not been able to get lmer to work while attempting
to specify the family as negative.binomial.  I get an error message that
says "could not find fuction "negative.binomial".

Is there a way to make lmer run negative binomial GLMMs with lmer in the
current version of R?

Thanks so much!

Marty

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