Unbalanced data and random effects

Thank you very much for these explanations. It is quite technical and I am not sure that I got it all, but I will try to find the book of Gelman&Hill to get more insight into 
shrinkage. I read the book of Zuur and as you said the topic is not extensively covered.

___________________________________________________________
Les pr?visions m?t?o pour aujourd'hui, demain et jusqu'? 8 jours ! Voila.fr http://meteo.voila.fr/