Table 2 Regression Coefficients for Cost Mode

Table 2
Regression Coefficients for Cost Mode

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Description of the variable Variable Coef. P > | t |
Cost of construction (Eij)
Lane-kilometers of construction In(Lij*ΔCij) 0.50 0.00*
Dummy for new construction N 0.39 0.04*
Dummy for interstate roads HI 1.97 0.00*
Dummy for state roads HS 0.56 0.02*
Log of (year-1979) ln(Y) 0.75 0.00*
Log of period of construction ln(P) 0.16 0.06*
Distance from nearest downtown X –0.03 0.04*
Constant   5.79 0.00*
Number of observations: 76
Adj. R2: 0.77

* Significant at 90% confidence interval.