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