Re: [R] AIC function and Step function

Thank you, Kingsford. Then I am wondering if there are other ways to write R codes to calculate the weights ? Thanks! Dana Kingsford Jones wrote: On Sun, Nov 30, 2008 at 5:05 PM, Dana77 [EMAIL PROTECTED] wrote: Thanks for kind help from Steven and Christos last time. Now I got new

Re: [R] AIC function and Step function

Thanks for kind help from Steven and Christos last time. Now I got new problem regarding the codes for calculating the weights (w) in AIC () function. The original code is as below: getAnywhere(logLik.lm) function (object, REML = FALSE, ...) { res - object$residuals p -

Re: [R] AIC function and Step function

On Sun, Nov 30, 2008 at 5:05 PM, Dana77 [EMAIL PROTECTED] wrote: Thanks for kind help from Steven and Christos last time. Now I got new problem regarding the codes for calculating the weights (w) in AIC () function. The original code is as below: getAnywhere(logLik.lm) function (object,

[R] AIC function and Step function

I would like to figure out the equations for calculating AIC in both step() function and AIC () function. They are different. Then I just type step in the R console, and found the AIC used in step() function is extractAIC. I went to the R help, and found: The criterion used is AIC = -

Re: [R] AIC function and Step function

of Dana77 Sent: Thu 11/27/2008 6:11 PM To: r-help@r-project.org Subject: [R] AIC function and Step function I would like to figure out the equations for calculating AIC in both step() function and AIC () function. They are different. Then I just type step in the R console, and found the AIC

Re: [R] AIC function and Step function

Hi Dana, Many thanks to Christos Hatzis who sent me an offline response, pointing out the new functions that make this much easier than my last suggestions: methods() and getAnywhere() methods(extractAIC) [1] extractAIC.aov* extractAIC.coxph* extractAIC.glm* extractAIC.lm*