# G-measure

## Description

The G-measure is the geometric mean of Recall and Precision. Precision (also called positive predictive value) is the fraction of retrieved instances that are relevant, while recall (also known as sensitivity) is the fraction of relevant instances that are retrieved.

Related formulas## Variables

G | G-measure (dimensionless) |

p | Precision (the number of correct results divided by the number of all returned results) (dimensionless) |

r | Recall ( the number of correct results divided by the number of results that should have been returned) (dimensionless) |