Precision and Recall at Five Sixths - Precision and Recall, Exactly

Compute both denominators at threshold five sixths.

highlighted = computed this step

Precision denominator at five sixths

TP plus FP is 1 + 0 = 1, so precision is 1.

\text{precision}={1\over1}=1

TP plus FN is 1 + 2 = 3, so recall is 1 over 3.

\text{recall}={1\over3}

Precision reads marked-positive rows. Recall reads actual-positive rows.

\text{precision denominator }TP+FP;\quad \text{recall denominator }TP+FN