GLM / Poisson with Overdispersion // use of AICc
Hello. I have encountered the following issue while modeling with GLM/Poisson the data in the attached table (Response = Count, Regressor = X). Data visual exploration suggests a clear relationship between X and Count, but comparison of AICc for model with X vs null model favors the Null model (just intercept). Scripts to reproduce the two models are embedded. I believe I have found an explanatio...