Research Article
A Gradient Boosting Crash Prediction Approach for Highway-Rail Grade Crossing Crash Analysis
Table 5
Comparison of three predictive accuracy measurements.
| | | DT | GB | | Training (%) | Testing (%) | Overall (%) | Training (%) | Testing (%) | Overall (%) |
| | Accuracy | 77.7 | 77.1 | 77.6 | 84.4 | 82.1 | 84.1 | | False rate | 22.3 | 22.9 | 22.4 | 15.6 | 17.9 | 15.9 | | Sensitivity | 84.1 | 88.9 | 84.6 | 88.6 | 88.6 | 88.6 | | Specificity | 77.2 | 76.3 | 77.1 | 84.1 | 81.6 | 83.8 | | Positive predictive ratio | 20.0 | 20.1 | 20.0 | 27.3 | 23.8 | 26.9 | | Negative predictive ratio | 98.6 | 99.0 | 98.7 | 99.1 | 99.1 | 99.1 |
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