**Precision(P) and Recall(R) ** Manual Annotation/Oracle/Ground Truth(X Axis) \\ System Output(Y Axis) | ^ Yes ^ No ^ ^ Yes | True Positive(TP) | False Positive(FP) | ^ No | False Negative(FN) | True Negative(TN) | P= TP/(TP+FP) R= TP/(TP+FN) F= 1/(1/P + 1/R)1/2 = 2PR/(P + R)