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I have calculated AIC by using R-studio to compare models. However, I got the following both negative and positive AIC

AIC 8.52 0.41 -7.70 -5.84 -3.84 -2.10

Should I select the negative AIC or positive AIC?

Should I select the absolute value of AIC?

Should I select the lowest AIC although it is the negative value?

Which model should I choose?

I am a bit confuse because normally I get the positive value of AIC.

Thank you.

Nong Nick
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  • AIC can be both negative or positive, the smaller the value the "better" the model. – Tim Apr 03 '15 at 19:50
  • Thank you Tim So, I should select AIC = -7.70. Is it correct? – Nong Nick Apr 03 '15 at 19:53
  • AIC is just a criteria for model selection that if is smaller then suggests "better" model but you never use such values alone but consider also other arguments for or against a model. – Tim Apr 03 '15 at 19:57
  • Thank you for you explanation. However, I just want to check my understanding whether AIC = -7.70 is the best for the above case. Am I correct? Can someone answer me? – Nong Nick Apr 03 '15 at 20:03
  • Yes, in this case it is the smallest value of those that you listed. – Tim Apr 03 '15 at 20:06

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