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Classification of virus detections on the basis of F-DNA coliphage densities using CART analyses
| CART model | Dependent (target) variable | Classification criterion: F-DNA coliphage density (PFU · 100 ml−1) | No. of samples with: |
% virus detection | |
|---|---|---|---|---|---|
| Virus detection | Virus nondetection | ||||
| 1 | Human virus | >87.5 | 41 | 6 | 87 |
| Human virus | ≤87.5 | 421 | 673 | 39 | |
| 2 | Animal virus | >141.5 | 25 | 13 | 66 |
| Animal virus | ≤141.5 | 386 | 717 | 35 | |
| 3 | Any virus | >141.5 | 36 | 2 | 95 |
| Any virus | ≤141.5 | 590 | 513 | 54 | |
