Calculating Sensitivity, Specificity, and Agreement from Logistics Regression Model

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Hi,

Assume I have a variable Y having two discrete values and two predictor variables x1 and x2.
I then do a logistic regression model fit as:

fit<-glm(Y~x1+x2,family=binomial). Are there functions in R than calculate the
Sensitivity, Specificity , and Agreement of the model "fit"?

Thanks
Meir
Beware as those 3 measures are discontinuous functions of x1 and x2, 
requiring completely arbitrary dichtomizations, and are improper scoring 
rules in the statistical sense.

Frank

********************************************
Meir Preiszler - Research Engineer
I t a m a r M e d i c a l Ltd. 
Caesarea, Israel:
Tel: +(972) 4 617 7000 ext 232
Fax: +(972) 4 627 5598
Cell: +(972) 54 699 9630
Email: pmeir at itamar-medical.com 
Web: www.Itamar-medical.com 
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