R help - Jun 2006 - How to request AIC information from "lm" object?

Can "lm" return AIC information?

Thanks a lot!

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Hi Michael,

use: extractAIC to get AIC from an lm object:

y <- rnorm(10)
extractAIC(lm(y~1))



Christian

You can use AIC to get what you want.

#example from lm help page
>  ctl <- c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14)
>      trt <- c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69)
>      group <- gl(2,10,20, labels=c("Ctl","Trt"))
>      weight <- c(ctl, trt)
>      anova(lm.D9 <- lm(weight ~ group))
Analysis of Variance Table

Response: weight
          Df Sum Sq Mean Sq F value Pr(>F)
group      1 0.6882  0.6882  1.4191  0.249
Residuals 18 8.7293  0.4850
#get the AIC of lm model.
> AIC(lm.D9)
[1] 46.17648



2006/6/9, Michael <comtech.usa at gmail.com>:
> Can "lm" return AIC information?
>
> Thanks a lot!
>
>         [[alternative HTML version deleted]]
>
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