Re: [R] R's AIC values differ from published values

2012-02-13 Thread Mark Leeds
hi: the definition of AIC can vary a lot from paper to paper and textbook to textbook because some people keep the multiplicative constants and other's don't. all that matters when using AIC is COMPARISON. the value itself means nothing. So, you'll be fine no matter what you use as long as you're c

Re: [R] R's AIC values differ from published values

2012-02-13 Thread Bert Gunter
This is answered in ?AIC. Have you read it? -- Bert On Mon, Feb 13, 2012 at 10:22 AM, david hamer wrote: > Using the Cement hardening data in Anderson (2008) Model Based Inference in > the Life Sciences. A Primer on Evidence, and working with the best model > which is >    lm  (  y  ~   x1   +  

[R] R's AIC values differ from published values

2012-02-13 Thread david hamer
Using the Cement hardening data in Anderson (2008) Model Based Inference in the Life Sciences. A Primer on Evidence, and working with the best model which is lm ( y ~ x1 + x2,data = cement ) the AIC value from R is model<-lm ( formula = y ~ x1 + x2 , da