[R] AIC extract and comparison

[Uwe Ligges]

Lisa wrote:
> Hi, I need to fit models and use AIC method to campare the best fitted model
> manually.
> 
> When i extract AIC by using extractAIC, it gave me the df and AIC values.
> Now the problem is, how can I compare the AIC values from two models?
> is there anyway to extract AIC with no df so that I can compare directly?
> Thank you!
> 
>> extractAIC(coxout)
> [1]    1.000 1723.038

extractAIC(coxout)[2]

Uwe



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