Table 1.

Measurements derived from target-decoy estimations of FP, TP, FN, TN

Measurement	Formula	Description
Precision	$\frac{\text{TP}}{\text{TP}+\text{FP}}$	Proportion of assignments passing selection criteria that are correct
False discovery rate (FDR)	$\frac{\text{FP}}{\text{TP}+\text{FP}}$, 1 - precision	Proportion of assignments passing selection criteria that are incorrect
Sensitivity	$\frac{\text{TP}}{\text{TP}+\text{FN}}$	Proportion of correct assignments passing selection criteria
Specificity	$\frac{\text{TP}}{\text{TP}+\text{FP}}$	Proportion of all incorrect assignments excluded by selection criteria
Accuracy	$\frac{\text{TP}+\text{TN}}{\text{TP}+\text{FP}+\text{TN}+\text{FP}}$	Proportion of all assignments correctly classified by selection criteria