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true positive rate and false positive rate for receiver operating characteristics (ROC) and area under the curve

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i assume you have T,Y element of {-1,1}, see also my <a href="http://snipplr.com/view/22109/area-under-the-curve-auc/">AUC function</a>.

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  1. function [TP,FP]=getfptp(T,Y)
  2.     Y(Y>=0)=1;Y(Y<0)=-1;  % target class (positive) is 1
  3.     TP=sum( ( (Y==1) + (T==1) )==2 );
  4.     FN=sum( ( (Y==-1) + (T==1) )==2 );
  5.     FP=sum( ( (Y==1) + (T==-1) )==2 );
  6.     TN=sum( ( (Y==-1) + (T==-1) )==2 );
  7.     TP=TP/(TP+FN);
  8.     FP=FP/(FP+TN);
  9. end

URL: http://www.myoutsourcedbrain.com/2008/11/receiver-operating-characteristic-roc.html

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