User:OrangePiggy

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

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

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