Research Article
A Gradient Boosting Crash Prediction Approach for Highway-Rail Grade Crossing Crash Analysis
Table 2
Misclassification rate vs learning rate and complexity of trees.
| Learning rate | Tree complexity | Class | Training data error percent | Testing data error percent | Number of trees |
| 0.05 | 2 | 0 | 0.1737 | 0.1847 | 1439 | 1 | 0.1691 | 0.1829 | | 4 | 0 | 0.1486 | 0.1611 | 468 | 1 | 0.1544 | 0.2927 | | 6 | 0 | 0.1404 | 0.1574 | 394 | 1 | 0.1397 | 0.2927 | | 8 | 0 | 0.1216 | 0.141 | 181 | 1 | 0.1287 | 0.3171 | | 15 | 0 | 0.112 | 0.1292 | 181 | 1 | 0.114 | 0.3171 | |
| 0.01 | 2 | 0 | 0.18 | 0.1938 | 2853 | 1 | 0.1949 | 0.2073 | | 4 | 0 | 0.1491 | 0.1629 | 2461 | 1 | 0.1581 | 0.2683 | | 6 | 0 | 0.143 | 0.1565 | 1424 | 1 | 0.1507 | 0.2683 | | 8 | 0 | 0.1399 | 0.1547 | 1092 | 1 | 0.1324 | 0.2561 | | 15 | 0 | 0.1153 | 0.1338 | 711 | 1 | 0.1176 | 0.3049 | |
| 0.005 | 2 | 0 | 0.1808 | 0.192 | 5317 | 1 | 0.2132 | 0.2073 | | 4 | 0 | 0.1514 | 0.1656 | 4528 | 1 | 0.1618 | 0.2561 | | 6 | 0 | 0.1446 | 0.1611 | 2745 | 1 | 0.1544 | 0.2561 | | 8 | 0 | 0.1277 | 0.1383 | 1986 | 1 | 0.1287 | 0.2927 | | 15 | 0 | 0.1164 | 0.1328 | 1387 | 1 | 0.1103 | 0.3049 | |
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