Table 2. Parameter estimates for nighttime injury severity MMNL model.
| Variable | Coefficient (standard deviation) | t-Statistic |
|---|---|---|
| Constant [IN] | 2.065 | 2.788 |
| Constant [F] | 4.444 | 3.85 |
| Young [IN] | -1.508 | -3.336 |
| Young [F] | -0.987 | -1.988 |
| Old [IN] | -2.441 | -2.716 |
| Old [F] | -2.955 | -2.417 |
| Male [IN] | 1.460 | 2.827 |
| Male [F] | 2.060 | 3.601 |
| Curve [F] | 1.755 | 2.486 |
| U-turn [IN] | 3.135 | 3.37 |
| Rural [IN] | 1.001 | 2.114 |
| Rural [F] | 1.169 | 2.369 |
| Angle crash [F]* | -1.324 | -1.745 |
| Sideswipe [IN] | -4.279 | -4.213 |
| Side swipe [F] | -2.405 | -2.831 |
| Heavy [IN] | 1.145 | 2.832 |
| Heavy [F] | 2.218 | 5.181 |
| Passenger [IN] | 5.380 | 9.579 |
| Passenger [F] | 6.335 | 10.098 |
| Multi-vehicle [F] | -1.98 | -3.087 |
| Winter [IN]* | 0.603 | 1.889 |
| Winter [F] | 0.833 | 2.407 |
| Rain [IN] | 2.199 | 4.083 |
| Concrete [IN] | 1.341 | 2.422 |
| Asphalt [IN] | 0.986 | 1.984 |
| Milling [IN] | -1.565 | -3.508 |
| Milling [F] | -2.557 | -5.053 |
| N. lane closures [F] | 0.971 | 2.198 |
| Speeding [IN] | 1.26 (0.467) | 2.706 |
| Speeding [F] | 1.402 | 2.796 |
| N observations | 746 | |
| Log-likelihood at convergence | -470.05 | |
| McFadden pseudo R2 | 0.371 | |
Note: Variables (*) are significant at 90% confidence level.