If all the models are fitted to the same data set, using the same modeling tools (you have to be careful e.g. comparing lmer models to glm models, because they use different additive constants), and everything seems to make sense (!!!), then yes. I would be a little surprised, and think that something was wrong, if you have some AIC values that are on the order of -20,000 (as below) and others that are +20,000 ...
Ben Bolker Corrado wrote: > My worry is: can I compare negative AIC with positive AIC? does the > comparison > still hold? > > On Thursday 10 September 2009 15:57:01 Ben Bolker wrote: >> Corrado-5 wrote: >>> Dear R list, >>> >>> I just obtained a negative AIC for two models (-221.7E+4 >>> and -230.2E+4). Is that normal? >> It's not necessarily wrong. See <http://emdbolker.wikidot.com/faq> > > > -- Ben Bolker Associate professor, Biology Dep't, Univ. of Florida bol...@ufl.edu / www.zoology.ufl.edu/bolker GPG key: www.zoology.ufl.edu/bolker/benbolker-publickey.asc
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