Error Matrix

Error matrix is a special type of the cross table with two dimensions - actual and forecasted.

Predicted	Actually
Predicted	Positive	Negative	$O C R = \frac{Σ T P + Σ T N}{Σ P + Σ N}$
Positive	True positive	False positive	$P P V = \frac{Σ T P}{Σ T P + Σ F P}$
Negative	False negative	True negative	$N P V = \frac{Σ T N}{Σ T N + Σ F N}$
	$T P R = \frac{Σ T P}{Σ P}$	$F P R = \frac{Σ F P}{Σ N}$	$F_{1} s c o r e = 2 \cdot \frac{P P V \cdot N P V}{P P V + N P V}$
	$F N R = \frac{Σ F N}{Σ P}$	$T N R = \frac{Σ T N}{Σ P}$

Note: Values of the used terms are available on Terms page.

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