R help - Nov 2008 - classification accuracy in logistic regression

Hi all,

I'm looking for a program that will take the predicted probabilities 
from a logistic regression using glm{stats}, dichotomize them according 
to a threshold that I can control, and then use them to form 
sensitivity, specificity, false pos and false neg rates.

Thanks in advance.

David


-- 
======================================================================David
Kaplan, Ph.D.
Professor
Department of Educational Psychology
University of Wisconsin - Madison
Educational Sciences, Room, 1061
1025 W. Johnson Street
Madison, WI 53706

email: dkaplan at education.wisc.edu
homepage:
http://www.education.wisc.edu/edpsych/default.aspx?content=kaplan.html
Phone: 608-262-0836

On Thu, 20 Nov 2008, David Kaplan wrote:
> Hi all,
>
> I'm looking for a program that will take the predicted probabilities
from a
> logistic regression using glm{stats}, dichotomize them according to a 
> threshold that I can control, and then use them to form sensitivity, 
> specificity, false pos and false neg rates.
I would look at the ROCR package on CRAN which provides convenient 
access to various measures and associated graphics.
Z
> Thanks in advance.
>
> David
>
>
> -- 
> ======================================================================>
David Kaplan, Ph.D.
> Professor
> Department of Educational Psychology
> University of Wisconsin - Madison
> Educational Sciences, Room, 1061
> 1025 W. Johnson Street
> Madison, WI 53706
>
> email: dkaplan at education.wisc.edu
> homepage:
> http://www.education.wisc.edu/edpsych/default.aspx?content=kaplan.html
> Phone: 608-262-0836
>
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