[R] AIC mathematical artefact or computation problem ?
lionel humbert
humbert.lionel at courrier.uqam.ca
Thu Mar 23 17:28:29 CET 2006
Dear R user,
I have made many logistic regression (glm function) with a second order
polynomial formula on a data set containing 440 observation of 96
variables. I’ve made the plot of AIC versus the frequency
(presence/observations) of each variable and I obtain a nearly perfect
arch effect with a symmetric axe for a frequency of 0.5 . I obtain the
same effect with deterministic data. Maybe I’ve miss something, but I
have found nothing that could explain this in the theoretical
calculation. Could it be due to the computation under R or AIC value is
a function of frequency ?
Thanks for your consideration
Lionel Humbert
PhD candidate
Inter-University Forest Ecology Research Group
University of Quebec in Montreal
More information about the R-help
mailing list