"Table 2 Regression Coefficients for Cost Mode
",,,
Description of the variable ,Variable ,Coef.,P > | t |
Cost of construction,(Eij),—,—
Lane-kilometers of construction,In(Lij*DCij),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.,,,