Table B-2 Downs Model
Wednesday, November 30, 2011
Table B-2 Downs Model
| Equation | ||||
|---|---|---|---|---|
| 1 | 2 | 3 | 4 | |
| Assumptions: Semantic differences: Cost: None-minor | 1 | 2.6 | 1 | 1.8 |
| Assumptions: Semantic differences: Cost: Minor-moderate | 1 | 1.0 | 1 | 1.0 |
| Assumptions: Semantic differences: Cost: Moderate-great | 1 | 1.0 | 1 | 1.0 |
| Assumptions: Component weights: Effectiveness: Extent | 1 | 1 | 1.0 | 1.0 |
| Assumptions: Component weights: Effectiveness: Impact | 1 | 1 | 1.3 | 1.1 |
| Assumptions: Component weights: Cost: Direct to commuters | 1 | 1 | 1.0 | 1.0 |
| Assumptions: Component weights: Cost: To all of society | 1 | 1 | 2.2 | 1.9 |
| Assumptions: Component weights: Implementation: Required institution | 1 | 1 | 13.0 | 11.0 |
| Assumptions: Component weights: Implementation: Ease of administration | 1 | 1 | 1.0 | 1.0 |
| Results: Estimated coefficients: Supply-side: Coefficient | 0.29* | 0.27* | 0.43* | 0.37* |
| Results: Estimated coefficients: Supply-side: Standard error | 0.14 | 0.13 | 0.14 | 0.13 |
| Results: Estimated coefficients: Supply-side: t-score | 2.16 | 2.11 | 3.05 | 2.80 |
| Results: Estimated coefficients: Effectiveness: Coefficient | -0.22 | -0.26* | -0.33* | -0.32* |
| Results: Estimated coefficients: Effectiveness: Standard error | 0.14 | 0.13 | 0.12 | 0.12 |
| Results: Estimated coefficients: Effectiveness: t-score | -1.58 | -2.01 | -2.77 | -2.79 |
| Results: Estimated coefficients: Cost: Coefficient | -0.59* | -0.58* | -0.64* | -0.62* |
| Results: Estimated coefficients: Cost: Standard error | 0.14 | 0.13 | 0.13 | 0.13 |
| Results: Estimated coefficients: Cost: t-score | -4.23 | -4.5 | -4.79 | -4.95 |
| Results: Estimated coefficients: Implementation: Coefficient | -0.3* | -0.36* | -0.28* | -0.35* |
| Results: Estimated coefficients: Implementation: Standard error | 0.13 | 0.13 | 0.13 | 0.2 |
| Results: Estimated coefficients: Implementation: t-score | -2.3 | -2.89 | -2.2 | -2.81 |
| Results: Goodness-of-fit: Standard error of Y | 0.61 | 0.59 | 0.56 | 0.55 |
| Results: Goodness-of-fit: R-squared | 69.30% | 71.10% | 74.50% | 75.40% |
| Results: Goodness-of-fit: Number of observations | 23 | 23 | 23 | 23 |
| Results: Goodness-of-fit: Degrees of freedom | 19 | 19 | 19 | 19 |
* significant at 0.01 level
** significant at 0.05 level
*** 1.00 < t < 2.00
d.f. = degrees of freedom
HOV = high-occupancy vechicle
NA = not applicable
SOV = single-occupancy vehicle
SRSD = studentized residual
TDM = travel demand management
TMA = transportation management association
TSM = transportation system management
U = data are unavailable
VHT = vehicle hours of travel
VMT = vehicle-miles traveled
* Significant at 95% confidence interval.