That's interesting dason. I had never seen random effects used in GLM, but I assumed it was something I had not run into. Since ANOVA is (I think) a form of GLM and ANOVA has random effects in some versions, how does that work?

Hmm! Although I agreed with Dason above, I guess that we have to agree that Noetsi is right about this one.

Since, in the old fashioned anova, there was a model with random effects, and that was a part of the general linear model, and thus also a part of a generalized linear model - a GLM, then GLM has random effects.

But maybe that is "old school". And now days GLM:s are only thought of as model with fixed effects. And if there are any random effects it would be called a "generalized linear mixed model". (In the old books it was called a "fixed effect model", "a random effect model" and "a mixed model" if it had both fixed and random effects.)

So maybe the nomenclature changes.