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In order to avoid the problem of defining the TN rate to create a ROC curve for your algorithm, people in the research departments are often using a precision-recall curve.
Looking at the formulas for both, you can see that the TN rate is the one that isn't used, due to it not saying anything interesting about the algorithm.
Precision: TP / (TP + FP)
Recall: TP / (TP + FN)
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