Table 6.
Model’s parameter estimates for significant variables.
| Explanatory Variable | Coefficient β | Standard Error. | Wald Statistic | Significance * p-Value |
Odds Ratio |
|---|---|---|---|---|---|
| Driver Characteristics | |||||
| Sleep | 1.023 | 0.42 | 5.982 | 0.01 | 2.781 |
| Distractions | 0.327 | 0.105 | 9.683 | 0.002 | 1.387 |
| Speeding | 0.676 | 0.09 | 62.724 | 0.001 | 1.966 |
| Crash Type | |||||
| Hit a moving vehicle | 0.564 | 0.06 | 93.724 | 0.02 | 1.757 |
| Hit a road fence | 0.723 | 0.16 | 21.548 | 0.03 | 2.06 |
| Hit an electric pole | 0.784 | 0.23 | 11.227 | 0.01 | 2.19 |
| Hit a pedestrian | 1.865 | 0.26 | 50.675 | 0.02 | 6.457 |
| Hit a motorcycle | 1.289 | 0.67 | 3.694 | 0.004 | 3.628 |
| Crash Reason | |||||
| Violate red signal | −1.572 | 0.381 | 16.985 | 0.02 | 0.208 |
| Sudden lane deviation | 0.242 | 0.085 | 8.084 | 0.004 | 1.273 |
| Weather | |||||
| Rainy | −2.532 | 1.112 | 5.182 | 0.003 | 0.079 |
| Constant | −5.938 | 0.48 | 155.86 | 0 | 0.003 |
Note: * parameters significant at α = 0.05; -2log-likelihood ratio= 4481.32; chi-square = 165.07; p-value < 0.001.