## can you help?

**A**n email received a few days ago:

Can you help me answering my query about AIC and DIC?

I want to compare the predictive power of a non Bayesian model (GWR, Geographically weighted regression) and a Bayesian hierarchical model (spLM).

For GWR, DIC is not defined, but AIC is.

For spLM, AIC is not defined, but DIC is.

How can I compare the predictive ability of these two models? Does it make sense to compare AIC of one with DIC of the other?

**I** did not reply as the answer is in the question: the numerical values of AIC and DIC do not compare. And since one estimation is Bayesian while the other is not, I do not think the predictive abilities can be compared. This is not even mentioning my reluctance to use DIC…as renewed in yesterday’s post.

October 13, 2013 at 4:19 am

Posterior predictive checks could help, don`t you think?

October 13, 2013 at 6:29 pm

They would certainly do better than DIC or AIC!