Table 4b Ordered Probit Model for Trip Occupancy: All Recreational Purposes
Table 4b
Ordered Probit Model for Trip Occupancy: All Recreational Purposes
| Dependent variable: trip occupancy (all recreational purposes) | Beta | SE | t-stat | P-value |
|---|---|---|---|---|
| Constant | 0.043 | 0.020 | 2.136 | 0.033 |
| HH members per vehicle owned | 0.349 | 0.006 | 57.435 | 0.000 |
| Income per household member | 9.77E-06 | 5.55E-07 | 17.622 | 0.000 |
| Population density | 1.95E-07 | 8.11E-08 | 2.404 | 0.016 |
| Weekend day indicator | 0.341 | 0.014 | 24.810 | 0.000 |
| SUV indicator | 0.316 | 0.027 | 11.925 | 0.000 |
| Pickup indicator | 0.196 | 0.025 | 7.802 | 0.000 |
| Minivan indicator | 0.524 | 0.019 | 27.929 | 0.000 |
| μo | 0.000 | na | na | na |
| μ1 | 1.055 | 0.009 | 113.721 | 0.000 |
| μ2 | 1.612 | 0.011 | 146.304 | 0.000 |
| μ3 | 2.247 | 0.014 | 160.105 | 0.000 |
Note: Trip occupancy is grouped into 1, 2, 3, 4, and 5+ person levels.
na = Not applicable.
| Log-likelihood function | |
|---|---|
| Constant only | 38686.52 |
| Convergence | 35948.44 |
| Pseudo-R2 | 0.071 |
Number of observations: 26,190 trips
Model form: Pr(Occupancy = 1) = Pr(μ* ≤ μo), Pr(Occupancy = 2) = Pr(μo ≤ μ* ≤ m1), Pr(Occupancy = 3) = Pr(μ1 ≤ μ* ≤ μ2), Pr(Occupancy = 4) = Pr(μ2 ≤ μ* ≤ μ3), and Pr(Occupancy ≥ 5) = Pr(μ3 ≤ μ*), where μ* = β′X + ε, and ε ~ Normal(0, 1)