I am using a generalized linear mixed model to analyze poisson and binary data. Animals were observed on several moments, so my model should account for that, which is why I am using the GLMM. I am convinced that the model is adequate, however, I do need to correct for overdispersion. However, I cannot find the way to do this in SPSS 20. I am not an SPSS-expert, so I have not found it. Can anyone tell me if it is possible to address overdispersion in SPSS GLMM?