[R-sig-ME] predicted mean from GLMM lower than mean from GAM

[benton]

Hi:

I fit a Poisson GLMM with only the intercept and two random effects, and 
the predicted mean was 1.14. When I fit a generalized additive model 
(GAM) with only the intercept, the predicted mean was 1.6. Does anyone 
know why this is happening? I'm looking for a theoretical response, as 
I've checked my code and there are no errors.

Thanks!

Katie Benton