Dear R users (r-help@r-project.org),

   The definition of  AIC (Akaike information criterion)
for normal error models has just been changed.
   Please refer to the paper below on this matter. Eq.(22) is
the new definition. The essential part is RSS(n+q+1)/(n-q-3);
it is close to GCV.  The paper is temporarily available at
the "Papers In Press" place.

Kunio Takezawa(2012): A Revision of AIC for Normal Error Models
Open Journal of Statistics, Vol.2. No.3
http://www.scirp.org/journal/ojs/

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