[R] extractAIC

[Roby]

Use extractAIC in frailty cox model (estimated with coxph function, gaussian
random effect) i obtaided

> extractAIC(fit.cox.f)
[1]   11.84563 8649.11736

but I don't know why I can't use the classic formulation of the AIC where
the degree of freedom are the number of the parameter (in my case 3).

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