Eventually it would be nice to add the beta-binomial distribution to handle overdispersion. For now, the only way to handle it is with an observation level random effect.
Use the robust method dbetabinom_robust recently written for glmmTMB by kaskr.
See section 4.1 of Tom Mitchell Elliott's master thesis for an attempted implementation of this in a Bayesian context (it had convergence difficulties). Or see Kitakado et al (2002) for a publication suggesting that we might need this.
Eventually it would be nice to add the beta-binomial distribution to handle overdispersion. For now, the only way to handle it is with an observation level random effect.
Use the robust method
dbetabinom_robustrecently written for glmmTMB by kaskr.See section 4.1 of Tom Mitchell Elliott's master thesis for an attempted implementation of this in a Bayesian context (it had convergence difficulties). Or see Kitakado et al (2002) for a publication suggesting that we might need this.