Table B-1 Arnold Model

Table B-1 Arnold Model

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  Equation
1 2 3 4
Assumptions: Semantic differences: Effectiveness: Minimum-average 1 1 1.0 1.0
Assumptions: Semantic differences: Effectiveness: Average-maximum 1 1 3.2 2.7
Assumptions: Semantic differences: Cost: Inexpensive-average 1 1 1.0 0.0
Assumptions: Semantic differences: Cost: Average-expensive 1 1 3.2 1.0
Assumptions: Semantic differences: Implementation: Easy-average 1 1 1.0 1.0
Assumptions: Semantic differences: Implementation: Average-difficult 1 1 3.2 1.7
Assumptions: Component weights Not applicable Not applicable Not applicable Not applicable
Results: Estimated coefficients: Add supply: Coefficient   0.29 0.31 0.35
Results: Estimated coefficients: Add supply: Standard error   0.19 0.21 0.21
Results: Estimated coefficients: Add supply: t-score   1.54 1.49 1.63
Results: Estimated coefficients: TDM: Coefficient   -0.16 -0.14 -0.15
Results: Estimated coefficients: TDM: Standard error   0.17 0.15 0.15
Results: Estimated coefficients: TDM: t-score   -0.96 -0.93  -1
Results: Estimated coefficients: Growth control: Coefficient   0.04 0.00 0.01
Results: Estimated coefficients: Growth control: Standard error   0.14 0.13 0.13
Results: Estimated coefficients: Growth control: t-score   0.28 -0.04 0.05
Results: Estimated coefficients: Effectiveness: Coefficient 0.64* 0.46* 0.54* 0.51*
Results: Estimated coefficients: Effectiveness: Standard error 0.14 0.19 0.19 0.19
Results: Estimated coefficients: Effectiveness: t-score 4.49 2.42 2.88 2.73
Results: Estimated coefficients: Cost: Coefficient -0.09 -0.15 -0.25 -0.28
Results: Estimated coefficients: Cost: Standard error 0.16 0.17 0.18 0.20
Results: Estimated coefficients: Cost: t-score -0.55 -0.85 -1.37 -1.38
Results: Estimated coefficients: Implementation: Coefficient -0.48* -0.61* -0.58* -0.57*
Results: Estimated coefficients: Implementation: Standard error 0.16 0.18 0.18 0.18
Results: Estimated coefficients: Implementation: t-score -3.06 -3.35 -3.28 -3.19
Results: Estimated coefficients: Goodness-of-fit: Standard error of Y 0.85 0.84 0.83 0.83
Results: Estimated coefficients: Goodness-of-fit: R-squared 32.40% 36.70% 38.60% 39.30%
Results: Estimated coefficients: Goodness-of-fit: Number of observations 53 53 53 53
Results: Estimated coefficients: Goodness-of-fit: Degrees of freedom 50 47 47 47

* 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.