> Von: Frank E Harrell Jr <f.harrell@vanderbilt.edu>
> Datum: 18. Dezember 2008 14:49:53 MEZ
> An: Meir Preiszler <pmeir@Itamar-Medical.com>
> Kopie: r-help@r-project.org
> Betreff: Re: [R] Calculating Sensitivity, Specificity, and Agreement  
> from Logistics Regression Model
>
>
> 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.

Hi Frank, maybe you should take a look at the ROCR package. I use it a  
lot (as well with logistic regression), it can plot and calculate many  
classification relevant indices.

Felix
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