User:OrangePiggy

$$\mbox{Recall}=\frac{|\{\mbox{tagged concepts}\}\cap\{\mbox{retrieved concepts}\}|}{|\{\mbox{tagged concepts}\}|} $$

$$\mbox{Precision}=\frac{|\{\mbox{tagged concepts}\}\cap\{\mbox{retrieved concepts}\}|}{|\{\mbox{retrieved concepts}\}|} $$

$$F = 2 \cdot (\mathrm{precision} \cdot \mathrm{recall}) / (\mathrm{precision} + \mathrm{recall}).\,$$