[R] Extended beta-binomial model in R

[Henrik Hermansson]

Dear all,

I have been searching far and wide for a solution to the problem of
negative intracluster correlation in the case of a binomial response
variable (also known as under-dispersion). Prentice (1986)
(http://www.jstor.org/stable/2289219) developed an extension of the
beta-binomial model which allowed for this negative correlation.
Palmquist (1997)(http://www.polmeth.wustl.edu/media/Paper/palmq97.pdf)
developed a module (ebb) for Stata which implemented this solution,
but this has since been discontinued and is no longer available on the
web.

Is there a package in R which implements the extended beta-binomial
model or otherwise allows for negative intracluster correlations?

The following packages and functions do not: aod, SensR, betareg,
VGAM, quasibinomial

(Also, if anyone has access to Palmquist's ebb module this would also
be very helpful.)

Many thanks in advance for any guidance!

Best regards
Henrik Hermansson

PhD Candidate
Department of Political Science
Trinity College Dublin