It doesn't, as far as I know. The function AIC.logLik is defined as

> AIC.logLik
function (object, ..., k = 2)
-2 * c(object) + k * attr(object, "df")
<environment: namespace:base>

-roger

Stephen Dicey wrote:
hello,
could somebody refer me to the reason R uses

-2*loglik + 2*(#param)+2

to calculate AIC?
thank you

--
Stoyan Iliev

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