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st: Akaike information criterion


From   M H Abraham <m.h.abraham@ucl.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Akaike information criterion
Date   Tue, 25 Aug 2009 16:58:23 +0100

I have two equations for the calculation of AIC:


AIC = 2k + n[ln(2*pi*RSS/n) +1]

AIC = 2k + n[ln(RSS/n)]

Which of these, if any, can be used to compare models that have 
different values of n (as well as different values of k) ?

If neither can be used for models with different values of n, can you 
suggest the correct equation.

many thanks indeed

Michael Abraham
Prof M H Abraham
Department of Chemistry
University College London
20 Gordon Street
London
WC1H 0AJ


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