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84 A P P E N D I X B Descriptive Statistics
Table B-1. Variables in MCS and MNCS models. Variable Units Non-missing observations Mean Median Std Dev Range 10th Pctl 90th Pctl TotalVMT Millions of miles 600 58,855.4 46,758.5 59,853.4 324,674.0 8,994.0 110,541.0 UrbanVMT Millions of miles 600 38,189.8 25,532.5 47,024.8 266,918.0 2,643.5 75,298.0 RuralVMT Millions of miles 600 20,665.6 17,419.0 15,586.2 85,131.0 4,033.5 38,043.0 ruralvmt_prop Proportion 600 0.44 0.44 0.19 0.91 0.19 0.72 cap_m_lag 1,000s dollars per highway mile (2013 dollars) 550 64.2 49.4 47.7 270.9 19.9 123.6 safe_total_m_lag 1,000s dollars per highway mile (2013 dollars) 550 10.8 8.2 10.0 58.1 2.5 23.5 gdp_cap Constant 2013 dollars 600 57,200.7 56,367.8 11,595.9 83,060.0 43,268.3 72,262.3 MedIncome Constant 2013 dollars 600 54,591.7 53,886.7 8,276.6 37,527.7 44,246.8 67,301.0 UnEmp_16_24 Percent 600 12.8 12.1 3.8 19.2 8.5 18.5 pump_price Constant 2013 dollars 600 2.81 2.84 0.6 2.88 1.95 3.68 Beer Gallons per capita 600 1.2 1.2 0.2 1.2 1.0 1.5 Wine Gallons per capita 600 0.4 0.3 0.2 0.9 0.2 0.6 BeltUse Percent 590 81.3 81.9 9.3 48.4 68.6 93.3 DUI_rating Index 600 19.3 19 3.3 17 15 24 Belt_rating Index 600 2.2 2 1.1 4 1 4 MC_hlmt_rating Index 600 2.7 2 1.2 4 2 4 post1991 Percent 600 93.4 95.3 4.7 15.4 86.9 97.6
Table B-2. Variables in change model. Variable Non-missing observations Mean Median Std Dev Range 10th Pctl 90th Pctl TotalVMT_chng 550 0.00622 0.00789 0.02562 0.35682 -0.02135 0.03286 Ruralvmt_prop_chng 550 -0.01939 -0.00265 0.07630 0.89543 -0.05241 0.01552 pump_price_chng 550 0.05467 0.09493 0.12895 0.56582 -0.10027 0.17155 gdp_cap_chng 550 -0.01966 -0.01713 0.06465 1.40280 -0.05227 0.01856 MedIncome_chng 550 -0.00553 -0.00444 0.02945 0.21803 -0.04311 0.02765 UnEmp_16_24_chng 550 0.03487 0.02442 0.19197 1.58067 -0.18368 0.30060 cap_m_chng_lag 500 0.00980 0.00442 0.19744 1.88702 -0.21202 0.23149 safe_total_m_chng_lag 500 0.02805 0.03784 0.31743 3.83360 -0.21989 0.29174 BeltUse_chng 537 0.01669 0.01056 0.04165 0.49134 -0.02260 0.06047 DUI_rating_chng 550 0.01356 0.00000 0.04602 0.47000 0.00000 0.05268 MC_hlmt_rating_chng 550 0.00000 0.00000 0.04184 1.38629 0.00000 0.00000 Beer_chng 550 -0.00591 -0.00755 0.03412 0.36229 -0.04078 0.02765 Wine_chng 550 0.02910 0.02740 0.05024 0.40705 -0.00552 0.08004 Post1991_chng 550 0.01556 0.01049 0.01463 0.04889 0.00308 0.02979