Accuracy measures | Interpretation | How to calculate |
True positive (TP) | Mineral correctly identified as present on the map | a |
False positive (FP) | Non-mineral incorrectly identified as present on the map | b |
True negative (TN) | Non-mineral correctly identified as absent on the map | d |
False negative (FN) | Mineral incorrectly identified as absent on the map | c |
Sensitivity | Conditional probability that a true “present” is correctly classified on the map | TP/(TP + FN) = a/(a + b) |
Specificity | Conditional probability that true “absent” is correctly classified on the map | TN/(TN + FP) = d/(b + d) |