Table 2-1
Trucking revenue model, truckload carriers — Domestic
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Domestic | Full sample | Restricted sample | Full sample | ||
---|---|---|---|---|---|
Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | |
coefficient | |||||
Intercept | 81.1Note *** | 81.0Note *** | 116.3Note *** | 123.1Note *** | 101.2Note *** |
1994 Q1 to 2001 Q2 | 1.6Note *** | 1.9Note *** | 2.7Note *** | 2.3Note ** | 2.4Note *** |
2001 Q3 | 12.5Note † | 20.2Note * | 1.4 | -1.0 | -1.0 |
2001 Q4 to 2002 Q2 | -0.6 | 1.4 | 3.0 | 3.6 | 0.7 |
2002 Q3 to 2003 Q4 | 5.7Note ** | 4.2 | -0.9 | -1.3 | 1.7 |
2004 Q1 | -3.5 | -1.1 | -19.3 | -34.9 | -6.0 |
2004 Q2 to 2004 Q4 | 8.9 | 8.3 | 10.0 | 15.6 | 8.3Note * |
2005 Q1 to 2009 Q4 | 1.7 | 1.5 | -0.5 | -0.6 | -0.2 |
Distance | 0.05Note ** | 0.05Note * | 0.10Note *** | 0.10Note *** | 0.10Note *** |
× tonnes | 0.106Note *** | 0.101Note *** | 0.0952Note *** | 0.091Note *** | 0.097Note *** |
× tonnes × diesel | 0.006 | 0.015Note † | 0.008 | 0.009 | 0.002 |
× tonnes × 1994 Q1 to 2003 Q4 | 0.0003Note *** | 0.0002Note *** | 0.0002Note ** | 0.0002Note ** | 0.0002Note ** |
× tonnes × 2004 Q1 to 2008 Q3 | 0.0007Note * | 0.0007Note † | 0.0008Note † | 0.0008Note * | 0.0007Note * |
× tonnes × 2008 Q4 to 2009 Q4 | -0.0034Note *** | -0.0033Note * | -0.0058Note *** | -0.0054Note *** | -0.0043Note *** |
× tonnes × tonnes | -0.00344Note *** | -0.00301Note *** | -0.00284Note *** | -0.00267Note *** | -0.00317Note *** |
× tonnes × tonnes × diesel | -0.000248 | -0.000810Note * | -0.000592 | -0.000602 | -0.0000322 |
× 1994 Q1 to 2003 Q4 | -0.0017Note * | -0.0026Note ** | -0.0025Note * | -0.0014 | -0.0011 |
× 2004 Q1 to 2008 Q3 | 0.0011 | 0.0028 | 0.0046 | 0.0022 | 0.0002 |
× 2008 Q4 to 2009 Q4 | -0.0016 | -0.0149 | -0.0100 | 0.0060 | 0.0123 |
× distance | -0.000009 | -0.000017Note † | -0.000022Note * | -0.000018Note * | -0.000011Note † |
× distance × 1994 Q1 to 2003 Q4 | -0.00000006 | 0.00000032 | 0.00000044 | 0.00000011 | -0.00000013 |
× distance × 2004 Q1 to 2008 Q3 | 0.0000005 | -0.0000001 | -0.0000004 | 0.0000002 | 0.0000006 |
× distance × 2008 Q4 to 2009 Q4 | -0.000002 | 0.000007 | 0.000008 | 0.000002 | -0.000005 |
Notes: 'Q1' signifies first quarter; 'Q2' signifies second quarter; 'Q3' signifies third quarter; 'Q4' signifies fourth quarter; '×' signifies multiplied by. Tests of statistical significance are based on robust standard errors corrected for within-group (trucking firm) correlation. |
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