Recall (TPR) [Imbalance]
Description
Recall, also recognized as sensitivity or the true positive rate (TPR), assesses the ratio of correctly identified positive instances among the total actual positive instances.
Recall is useful when the cost of false negatives is high.
Formula
The precise definition of recall is the number of true positives divided by the number of true positives plus the number of false negatives.
\[ \text{Recall} = \frac{\text{Relevant retrieved instances}}{\text{All relevant instances}} \]
- Relevant retrieved instances: Total correctly identified positive instances
- All relevant instances: Total actual positive instances