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st: AIC for GAM

From   Yoshiro Nagao <>
Subject   st: AIC for GAM
Date   Tue, 12 Feb 2008 06:09:23 +0900 (JST)

Dear all,

Is it possible to calculate AIC
from an output for "gam"?

"gam" outputs deviance and dispersion.

Although I came across an equation of

AIC = deviance/n + 2*df*deviance/(n-df)/n,

AIC obtained from this calculation was
1000 times larger than the AIC generated
by an equally predictive "glm" model.

Yoshiro Nagao 

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