[R] Calculating Sensitivity, Specificity, and Agreement from Logistics Regression Model

[Frank E Harrell Jr]

Meir Preiszler wrote:
> 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
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-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University