. 2020 Nov 26;6(12):129. doi: 10.3390/jimaging6120129

Table 3.

Evaluation metrics adopted during the relevance feedback stage.

Metric	Equation
True Positive Rate	$T P R = \frac{T P}{T P + F N}$
True Negative Rate	$T N R = \frac{T N}{T N + F P}$
Positive Predictive Value	$P P V = \frac{T P}{T P + F P}$
Negative Predictive Value	$N P V = \frac{T N}{T N + F N}$
Accuracy	$A C C = \frac{T P + F N}{T P + F P + T N + F N}$
$F_{1}$ -Score(Positive)	$F_{1}^{P} = \frac{2 \cdot P P V \cdot T P R}{P P V + T P R}$
$F_{1}$ -Score(Negative)	$F_{1}^{N} = \frac{2 \cdot N P V \cdot T N R}{N P V + T N R}$
Matthew’s Correlation Coefficient	$M C C = \frac{T P \cdot T N - F P \cdot F N}{\sqrt{(T P + F P) \cdot (T P + F N) \cdot (T N + F P) \cdot (T N + F N)}}$