This is not a typo error, in feature detection when it was not able to
calculate 'tn' then they are using this formula and there are more papers
(referred journal) which quote same formula. In the same manner i had also
got the tp, fp and fn. Based on it can some one suggest me to plot the ROC
curve for  all the 6 data.

http://r.789695.n4.nabble.com/file/n4640683/tpr2.jpg 



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