[R] AUC for logistic regression [was: (no subject)]

[Joe Nocera]

I believe that Roman is referring to AUC as the "Area Under Curve" from a Receiver
Operating Characteristic.  

If this indeed your quantity of interest - it can be calculated in R.  You can download
code at:

http://www.bioconductor.org/repository/release1.5/package/Win32/
and/or
http://biostat.ku.dk/~bxc/SPE/library/

Check out the archives - I'm sure there is more there if you search "ROC" instead.

Cheers,
Joe

Quoting Spencer Graves <spencer.graves at pdf.com>:

>       What's AUC?  If you mean AIC (Akaike Information Criterion), and 
> if you fit logistic regression using "glm", the help file says that glm 
> returns an object of class "glm", which is a list containing among other 
> things an attribute aic.  For example, suppose you fit a model as follows: 
> 
>       fit <- glm(y~x, famil=binomial()...)
> 
>       Then fit$aic returns the AIC. 
> 
>       You may also wish to consider anova and anova.glm. 
> 
>       hope this helps.  spencer graves
> 
> rrouzier at mdanderson.org wrote:
> 
> >Dear R-helper,
> >
> >I would like to compare the AUC of two logistic regression models (same 
> >population). Is it possible with R ?
> >
> >Thank you
> >
> >Roman Rouzier
> >	[[alternative HTML version deleted]]
> >
> >______________________________________________
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> >  
> >
> 
> -- 
> Spencer Graves, PhD, Senior Development Engineer
> O:  (408)938-4420;  mobile:  (408)655-4567
> 
> ______________________________________________
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> 


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Joseph J. Nocera
Ph.D. Candidate
NB Coop. Fish & Wildlife Research Unit
Biology Department - Univ. New Brunswick
Fredericton, NB
Canada   E3B 6E1
tel: (902) 679-5733

"Why does it have to be spiders?  Why can't it be 'follow the butterflies'"?!
    - Ron Weasley, Harry Potter & The Chamber of Secrets