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A summary of the four annotation types and the performance metrics for the ICD-9 system as a classifier.
| Annotation Types | ICD-9 | Annotation | Number of Instances | Sensitivity = TP/P = TP/(TP+FN) = 39/(39+0) = 1.00 Specificity = TN/N = TN/(FP+TN) = 29/(15+29) ≈ 0.66 Precision = TP/(TP+FP) = 39/(39+15) ≈ 0.72 |
| TP | + | + | 39 | |
| FP | + | − | 15 | |
| TN | − | − | 29 | |
| FN | − | + | 0 |
