Hello! I am trying to model data on species abundance (count data) with a poisson error distribution. I have a fixed and a random variables and thus needs a mixed model. I strongly doubt that my model is overdispersed but I don't know how to get the overdispersion parameter in a mixed model. Maybe someone can help me on this point. Secondly, it seems that quasi models cannot be implemented with the function lmer, is there an option? If not, I certainly should go to variable transformation and use a gaussian error distribution, but it is not optimal. Thank you!
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