3.1.2 G-mean1, G-mean2, F-measure
Some researchers use G-mean1, G-mean2, and F-measure metrics for the
evaluation of prediction systems, which are built on imbalanced datasets.
Formulas 6, 7, and 8 show how to calculate these measures, respectively. Formula
4 is used for precision parameter and True Negative Rate (TNR) is calculated by
using Formula 5. The formula for recall is given in Formula 1.