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Distribution and interpretation of outliers determined by different methods.
| Method | Input errors | Measurement errors | Abnormal values |
|---|---|---|---|
| z-score | 3 | 3 | 3 |
| Isolation forest | 1 | 5 | 4 |
| DBSCAN | 3 | 3 | 2 |
| KNN | 4 | 3 | 1 |
| OSVM | 3 | 7 | 6 |
| EllipticEnvelope | 3 | 2 | 1 |
| Autoencoder | 4 | 9 | 8 |
| Studies identified as outliers | 4 | 15 | 13 |
OSVM-determined values differ from Table 4 due to some studies being marked as outliers twice by different radiologists.
