On Tue, 3 Jul 2007, Selene Zárate wrote:
I am using the stepAIC function on the MASS package that does model
selection by exact AIC. I'm not sure what the term 'exact AIC' means,
and how it differs from AIC.
It doesn't, but there are approximations to AIC in use. This is explained
in the book stepAIC supports (one is C_p, for example).
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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