From: Volatile organic compounds: instrumental and canine detections link an individual to the crime scene
Trials | Scent-article | Positive | True positive (TP) | False positive (FP) | PPV | Negative | True negative (TN) | False negative (FN) | NPV | Sensitivity | Specificity | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Man A | 200 | Ceramic | 194 | 190 | 4 | 97.94% | 6 | 6 | 0 | 100.00% | 100.00% | 60.00% |
200 | Plastic | 194 | 193 | 1 | 99.48% | 6 | 6 | 0 | 100.00% | 100.00% | 85.71% | |
Man B | 200 | Ceramic | 193 | 191 | 2 | 98.96% | 7 | 6 | 1 | 85.71% | 99.48% | 75.00% |
200 | Plastic | 198 | 198 | 0 | 100.00% | 2 | 2 | 0 | 100.00% | 100.00% | 100.00% | |
Woman A | 200 | Treated wood | 192 | 191 | 1 | 99.48% | 8 | 7 | 1 | 87.50% | 99.48% | 87.50% |
200 | Wax | 200 | 200 | 0 | 100.00% | 0 | 0 | 0 | 100.00% | |||
Woman B | 200 | Treated wood | 196 | 195 | 1 | 99.49% | 4 | 4 | 0 | 100.00% | 100.00% | 80.00% |
200 | Wax | 199 | 199 | 0 | 100.00% | 1 | 1 | 0 | 100.00% | 100.00% | 100.00% |