Revision: 19729
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at October 29, 2009 15:15 by benjamin
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function [TP,FP]=getfptp(T,Y) Y(Y>=0)=1;Y(Y<0)=-1; % target class (positive) is 1 TP=sum( ( (Y==1) + (T==1) )==2 ); FN=sum( ( (Y==-1) + (T==1) )==2 ); FP=sum( ( (Y==1) + (T==-1) )==2 ); TN=sum( ( (Y==-1) + (T==-1) )==2 ); TP=TP/(TP+FN); FP=FP/(FP+TN); end
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http://www.myoutsourcedbrain.com/2008/11/receiver-operating-characteristic-roc.html
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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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true positive rate and false positive rate for receiver operating characteristics (ROC) and area under the curve
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MatLab