On Fri, Nov 23, 2012 at 7:58 AM, brunosm <brunosm87@gmail.com> wrote:

> Hi all,
>
> does anyone know why the area under the curve (AUC) is negative?
>
> I'm using ROC function with a logistic regression, package Epi.
>
> First time it happens...
>
>
Have you looked at the ROC curve?

That should tell you whether there's some strange non-convexity going on or
whether the variable is just being put into the calculations backwards.

   -thomas


-- 
Thomas Lumley
Professor of Biostatistics
University of Auckland

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