[R] Help documentation in extractAIC

[Adler, Avraham]

Hello.

The sentence in extractAIC's help <http://www.stat.psu.edu/~dhunter/R/html/stats/html/extractAIC.html> which discusses AIC's estimate of -2logL from RSS reads: "AIC only handles unknown scale and uses the formula n log (RSS/n) - n + n log 2pi - sum(log w) where w are the weights. Further AIC counts the scale estimation as a parameter in the edf and extractAIC does not." Am I misunderstanding something, or should it have a +n as the second term and not a -n? That's what seems to be happening in gaussian()$aic (not counting an extra addition of +2). It also could be that I've confused something somewhere, so I appreciate any elucidation.

Thank you,

Avraham Adler