The macro weighted (by class size) average Recall. In macro-averaging, Recall is computed locally over each category ?rst and then the average over all categories is taken, weighted by the number of instances of that class. Conversely, in micro-averaging, Recall is computed globally over all category decisions.
See WEKA's Evaluation class
| Minimum value | 0 |
| Maximum value | 1 |
| Unit | |
| Optimization | Higher is better |