 Dear All!

This is not a real mixed models related question, but I really would be gratefull if somebody could help me.

1) I'm always getting confused using AIC for model selection. Mainly I have 4 models with quite similar AICs (i.e. -5.88, -5.43, -5.14, -5.10). Is the AIC reliable in this case?

2) What to do when my model contains a variable with significant effect, but the AIC decreases when I get rid of it?  Keep it or leave it out of the model?

Best regards,
Balazs



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