[R] An AIC model selection question

Christoph Scherber Christoph.Scherber at agr.uni-goettingen.de
Thu Oct 2 09:35:45 CEST 2008

Dear R users,

Assume I have three models with the following AIC values:

model	AIC	df
model1 	-10	2
model2	-12	5
model3	-11	2

Obviously, model2 would be preferred, but it "wastes" 5 df compared to the other models.

Would it be allowed to select model3 instead, simply because it uses up less df and the delta-AIC 
between model2 and model3 is just 1?

Many thanks for any suggestions/comments!
Best wishes

Dr. rer.nat. Christoph Scherber
University of Goettingen
DNPW, Agroecology
Waldweg 26
D-37073 Goettingen

phone +49 (0)551 39 8807
fax   +49 (0)551 39 8806

Homepage http://www.gwdg.de/~cscherb1

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