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. 2002 Feb 21;3(3):research0013.1–research0013.16. doi: 10.1186/gb-2002-3-3-research0013

Table 5.

Definitions of parameters used in evaluating the predictions

Evaluation Formula
Sensitivity TP/(TP + FN)
Specificity TN/(TN + FP)
Accuracy (TP + TN)/(TP + TN + FP + FN)
Positive predictive value (PPV) TP/(TP +FP)
Overall performance (OP) (Accuracy + PPV)/2

FN, false negative; FP, false positive; TN, true negatives; TP, true positives.