| Category 1 | Category 2 | ||||||
| Total Cost | Total Cost | ||||||
| Dependent Variable: | lntot | Dependent Variable: | lntot | ||||
| Indep Variable | Estimated Coefficient | Standard Error | t-Statistic | Indep Variable | Estimated Coefficient | Standard Error | t-Statistic |
| one | 8.20468 | 0.54838 | 14.96167 | one | 5.46705 | 0.44544 | 12.27327 |
| age | 6.28091e−002 | 1.25052e−002 | 5.02264 | lyear | −0.53229 | 0.21494 | −2.47648 |
| lyear | −0.34813 | 0.20126 | −1.72979 | elev | 4.81895e−004 | 9.19892e−005 | 5.23861 |
| ac | 0.95257 | 0.21990 | 4.33179 | aadt | 3.76878e−005 | 1.08794e−005 | 3.46415 |
| elev | −9.52315e−004 | 1.69739e−004 | −5.61045 |
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|
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| aadt | 2.81009e−005 | 3.89760e−006 | 7.20981 |
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| Number of Observations | 201 | Number of Observations | 93 | ||||
| Corrected R-squared | 0.46536 | Corrected R-squared |
| 0.23575 | |||
| Mean of Dependent Variable | 7.88086 | Mean of Dependent Variable | 7.76939 | ||||
| Labor Cost | Labor Cost | ||||||
| Dependent Variable: | lnlabor | Dependent Variable: | lnlabor | ||||
| Indep Variable | Estimated Coefficient | Standard Error | t-Statistic | Indep Variable | Estimated Coefficient | Standard Error | t-Statistic |
| one | 7.65243 | 0.51194 | 14.94798 | one | 4.96110 | 0.38960 | 12.73369 |
| age | 5.84997e−002 | 1.16742e−002 | 5.01104 | elev | 3.95786e−004 | 8.00296e−005 | 4.94550 |
| lyear | −0.33534 | 0.18788 | −1.78483 | urban | −0.32518 | 0.13213 | −2.46100 |
| ac | 0.91071 | 0.20529 | 4.43621 | aadt | 4.40071e−005 | 9.81890e−006 | 4.48188 |
| elev | −9.38479e−004 | 1.58459e−004 | −5.92252 |
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| aadt | 2.58324e−005 | 3.63858e−006 | 7.09957 |
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| Number of Observations | 201 | Number of Observations | 93 | ||||
| Corrected R-squared | 0.46627 | Corrected R-squared | 0.25454 | ||||
| Mean of Dependent Variable | 7.23326 | Mean of Dependent Variable | 6.93872 | ||||
| Category 1 | Category 2 | ||||||
| Materials Cost | Materials Cost | ||||||
| Dependent Variable: | lnma | Dependent Variable: | lnma | ||||
| Indep Variable | Estimated Coefficient | Standard Error | t-Statistic | Indep Variable | Estimated Coefficient | Standard Error | t-Statistic |
| one | 5.87373 | 0.75837 | 7.74515 | one | 2.52197 | 0.74212 | 3.39834 |
| age | 7.38305e−002 | 1.68890e−002 | 4.37151 | lyear | −1.31390 | 0.35809 | −3.66918 |