Hello,
I'm not familliar with SAR and CAR model, but smaller AIC is better than
larger AIC. The important thing here is to have the same Y vector (which
you have)
See the Burnham and Anderson's book for a full, well explained explanation
on AIC:
Burnham, K. P.; Anderson, D. R. (2002), Model Selection and Multimodel
Inference: A Practical Information-Theoretic Approach (2nd ed.),
Springer-Verlag,
Bastien
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