TN=0 in all cases, i had only tp, fp and fn for 6 images (two sets). suggest me how plot the roc curve. -- View this message in context: http://r.789695.n4.nabble.com/no-true-negative-data-need-roc-curve-tp4640474p4640558.html Sent from the R help mailing list archive at Nabble.com.