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Appendix A. Regression equations

Tuesday, April 21, 2015

Excel

Table A1. Household Person Miles Traveled, Northeast Region

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -4.90389 -2.79 0.0053 -10.42098 -3.84 0.0001 -6.93912 -2.83 0.0046
HH Income (Thous. $) 0.15254 6.85 <.0001 0.26662 10.39 <.0001 0.10389 4.98 <.0001
Nat. Log. (HH Income)                  
Count of HH Vehicles 14.2224 14.18 <.0001 9.15699 7.63 <.0001 6.23972 7.39 <.0001
Count of HH Members       4.59441 3.93 <.0001 8.25954 7.78 <.0001
Homeowner             12.44722 5.54 <.0001
Number of Workers 12.14633 9.63 <.0001 18.82581 12.02 <.0001 19.49523 15.23 <.0001
Life Cycle (1+C <18) 11.82162 4.99 <.0001 23.44566 6.96 <.0001 17.81782 6.35 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+) 5.91647 2.39 0.0167       7.55948 3.23 0.0012
Life Cycle (2+P hh, 1+ 65+) 11.30437 4.21 <.0001            
Adj. R-Sq 0.2359     0.3016     0.2649    
F Value 198.21     297.06     301.48    
Obser. Used 3,834     3,428     5,837    


Table A2. Household Person Miles Traveled, Midwest Region

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -18.53276 -3.65 0.0003 -31.94327 -6.77 <.0001 -1.51671 -0.54 0.5899
HH Income (Thous. $)             0.22119 7.3 <.0001
Nat. Log. (HH Income) 6.08751 4.13 <.0001 10.86391 7.93 <.0001      
Count of HH Vehicles 8.63627 6.48 <.0001 8.61841 7.16 <.0001 9.89173 10.04 <.0001
Count of HH Members 6.57575 6.09 <.0001 6.12712 5.1 <.0001 7.23071 5.11 <.0001
Homeowner                  
Number of Workers 11.19997 6.29 <.0001 9.98903 6.35 <.0001 10.09978 6.23 <.0001
Life Cycle (1+C <18) 17.93537 4.74 <.0001 23.96875 7.02 <.0001 22.36621 6.33 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)             12.40232 3.27 0.0011
Life Cycle (2+P hh, 1+ 65+) 9.56362 2.59 0.0097 7.62373 2.7 0.0071 19.06278 4.76 <.0001
Adj. R-Sq 0.1901     0.2788     0.2178    
F Value 102.26     176.28     191.44    
Obser. Used 2,590     2,722     4,788    


Table A3. Household Person Miles Traveled, South Atlantic Division

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -14.26603 -6.22 <.0001 -27.64752 -11.22 <.0001 -20.69411 -8.75 <.0001
HH Income (Thous. $)                  
Nat. Log. (HH Income) 4.08374 5.89 <.0001 5.02763 7 <.0001 7.84196 11.74 <.0001
Count of HH Vehicles 8.65949 11.55 <.0001 6.58772 9.7 <.0001 7.20962 12.76 <.0001
Count of HH Members 6.10484 9.48 <.0001 11.36489 19.05 <.0001 9.15223 13.67 <.0001
Homeowner 4.89731 3.81 0.0001 12.96845 9.61 <.0001      
Number of Workers 12.11984 13.5 <.0001 14.90795 18.39 <.0001 20.73558 25.6 <.0001
Life Cycle (1+C <18) 4.13395 2.28 0.0228 21.836 12.46 <.0001 23.78731 13.81 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+) 3.22884 2.09 0.0364       5.58823 2.93 0.0034
Life Cycle (2+P hh, 1+ 65+)             9.42649 4.73 <.0001
Adj. R-Sq 0.2323     0.2794     0.2404    
F Value 297.44     773.39     783.2    
Obser. Used 6,858     11,954     17,302    


Table A4. Household Person Miles Traveled, South Central Divisions

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -3.71181 -2.09 0.0363 -0.01066 0 0.9965 -4.48476 -1.2 0.2301
HH Income (Thous. $) 0.14754 7.92 <.0001 0.10005 3.93 <.0001      
Nat. Log. (HH Income)             4.84099 4.21 <.0001
Count of HH Vehicles 7.43074 8.66 <.0001 5.52206 4.67 <.0001 9.03662 10.16 <.0001
Count of HH Members 6.26425 9.02   5.27392 4.52 <.0001 6.95034 6.79 <.0001
Homeowner       8.12363 3.44 0.0006 4.78322 2.08 0.0379
Number of Workers 14.64502 14 <.0001 18.56716 12.28 <.0001 14.83442 10.87 <.0001
Life Cycle (1+C <18) 8.91941 3.88 0.0001 11.09247 3.53 0.0004 17.10156 5.91 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)       5.45212 2.07 0.0381 14.42793 5.98 <.0001
Life Cycle (2+P hh, 1+ 65+) 9.10236 4.69 <.0001            
Adj. R-Sq 0.2115     0.193     0.1873    
F Value 253.66     140.91     247.83    
Obser. Used 5,654     4,096     7,498    


Table A5. Household Person Miles Traveled, Mountain Division

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -4.30522 -1.82 0.687 -2.4286 -0.35 0.7274 -19.4076 -4 <.0001
HH Income (Thous. $) 0.25992 8.62 <.0001       0.36084 7.92 <.0001
Nat. Log. (HH Income)       4.74469 2.35 0.0191      
Count of HH Vehicles       14.9524 8 <.0001      
Count of HH Members             14.49196 11.53 <.0001
Homeowner 23.90581 10.1 <.0001 -15.58373 -4 <.0001 24.3604 5.98 <.0001
Number of Workers 5.42787 3.39 0.0007 10.72817 4.28 <.0001 13.47898 5.47 <.0001
Life Cycle (1+C <18) 23.49604 8.13 <.0001 57.11182 12.99 <.0001      
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+) 19.98444 6.2 <.0001            
Life Cycle (2+P hh, 1+ 65+) 30.34287 8.56 <.0001 9.77042 2.17 0.03      
Adj. R-Sq 0.2235     0.2439     0.2034    
F Value 128.64     78.75     117.2    
Obser. Used 2,662     1,447     1,821    


Table A6. Household Person Miles Traveled, Pacific Division

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -22.84603 -8.96 <.0001 -0.32442 -0.12 0.9072 -8.07112 -2.59 0.0096
HH Income (Thous. $)       0.17093 6.68 <.0001 0.12915 4.99 <.0001
Nat. Log. (HH Income) 8.12967 11.7 <.0001            
Count of HH Vehicles 6.99802 11.52 <.0001 6.78767 5.98 <.0001 7.45839 7.15 <.0001
Count of HH Members 2.35964 3.76 0.0002       7.06326 7.18 <.0001
Homeowner             10.44439 4.16 <.0001
Number of Workers 14.66817 17.44 <.0001 14.83345 9.33 <.0001 16.17204 11.84 <.0001
Life Cycle (1+C <18) 15.39396 8.79 <.0001 31.29349 10.31 <.0001 9.61159 317 0.0015
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+) 4.65203 2.42 0.0156 7.28163 2.09 0.0363      
Life Cycle (2+P hh, 1+ 65+) 10.28514 5.04 <.0001 21.13945 5.73 <.0001      
Adj. R-Sq 0.2095     0.2414     0.2259    
F Value 344.03     128.21     159.18    
Obser. Used 9,061     2,399     3,253    


Table A7. Household Number of Person Trips, Northeast Region

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -0.84589 -2.97 0.003 -0.61741 -1.65 0.0989 -0.09066 -0.33 0.7407
HH Income (Thous. $)                  
Nat. Log. (HH Income) 0.82447 10.02 <.0001 0.62762 6.13 <.0001 0.4932 6.21 <.0001
Count of HH Vehicles 0.50103 6.31 <.0001 0.60927 7.16 <.0001 0.50558 8.45 <.0001
Count of HH Members 1.20312 17.6 <.0001 0.77567 7.7 <.0001 0.55677 7.76 <.0001
Homeowner             0.34381 2.19 0.0287
Number of Workers 1.32314 12.94 <.0001 1.32394 11.79 <.0001 1.81108 20.62 <.0001
Life Cycle (1+C <18) 3.12092 14.13 <.0001 4.52392 18.91 <.0001 5.61503 28.22 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)       0.74446 2.55 0.0108      
Life Cycle (2+P hh, 1+ 65+) 0.69231 3.69 0.0002 1.40737 5.15 <.0001 1.4937 9.03 <.0001
Adj. R-Sq 0.4765     0.4818     0.4506    
F Value 579.65     455.86     686.22    
Obser. Used 3,816     3,426     5,850    


Table A8. Household Number of Person Trips, Midwest Region

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -1.40404 -3.71 0.0002 0.24217 1.1 0.2714 1.41369 7.35 <.0001
HH Income (Thous. $)       0.01462 6.68 <.0001 0.02186 11.53 <.0001
Nat. Log. (HH Income) 0.71205 6.14 <.0001            
Count of HH Vehicles 0.20116 2 0.0455 0.32065 3.12 0.0018      
Count of HH Members 1.38873 17.12 <.0001 1.35458 13.64 <.0001 0.82884 10.77 <.0001
Homeowner 0.52661 2.57 0.0101 0.5604 2.75 0.006 0.76233 4.28 <.0001
Number of Workers 1.79676 13.65 <.0001 1.5156 11.95 <.0001 1.42932 14.89 <.0001
Life Cycle (1+C <18) 4.46153 16.01 <.0001 3.63006 13.09 <.0001 4.63386 21.25 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)                  
Life Cycle (2+P hh, 1+ 65+) 2.06594 7.5 <.0001 2.90201 12.62 <.0001 2.1046 10.56 <.0001
Adj. R-Sq 0.523     0.5068     0.4215    
F Value 405.18     399.16     583.73    
Obser. Used 2,581     2,713     4,799    


Table A9. Household Number of Person Trips, South Atlantic Division

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -0.3239 -1.57 0.1174 -0.89222 -4.82 <.0001 0.05795 0.39 0.6997
HH Income (Thous. $)                  
Nat. Log. (HH Income) 0.46841 7.47 <.0001 0.62416 11.57 <.0001 0.55126 13.23 <.0001
Count of HH Vehicles 0.16473 2.42 0.0154 0.20644 4.04 <.0001 0.11733 3.31 0.0009
Count of HH Members 1.32925 23.48 <.0001 1.25278 27.13 <.0001 1.14865 30.46 <.0001
Homeowner 0.76755 6.57 <.0001 0.76187 7.44 <.0001      
Number of Workers 1.34154 16.69 <.0001 1.34255 21.21 <.0001 1.61837 31.61 <.0001
Life Cycle (1+C <18) 3.87228 23.28 <.0001 4.66524 34.6 <.0001 3.28367 30.12 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)                  
Life Cycle (2+P hh, 1+ 65+) 0.42279 2.91 0.0037 0.98065 8.37 <.0001 1.26067 13.38 <.0001
Adj. R-Sq 0.4578     0.469     0.3762    
F Value 827.35     1511.29     1750.84    
Obser. Used 6,853     11,970     17,412    


Table A10. Household Number of Person Trips, South Central Divisions

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -0.23305 -0.94 0.3493 0.56102 2.05 0.04 0.52902 2.35 0.019
HH Income (Thous. $)                  
Nat. Log. (HH Income) 0.48226 6.82 <.0001 0.27891 3.22 0.0013 0.46068 6.92 <.0001
Count of HH Vehicles 0.65458 8.93 <.0001 0.29566 3.3 0.001 0.17237 3.28 0.001
Count of HH Members 1.04587 17.54 <.0001 0.77073 9.6 <.0001 0.95417 13.69 <.0001
Homeowner       1.03325 5.81 <.0001      
Number of Workers 1.56111 17.35 <.0001 1.79764 15.89 <.0001 1.29593 15.88 <.0001
Life Cycle (1+C <18) 4.35704 22.52 <.0001 5.27548 22.86 <.0001 4.49126 25.14 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)             0.76208 3.97 <.0001
Life Cycle (2+P hh, 1+ 65+) 1.07076 6.57 <.0001 1.62816 7.49 <.0001 1.12207 5.57 <.0001
Adj. R-Sq 0.4432     0.4211     0.4063    
F Value 750.43     426.77     738.49    
Obser. Used 5,651     4,098     7,545    


Table A11. Household Number of Person Trips, Mountain Division

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept 1.22651 6.22 <.0001 -0.09795 -0.32 0.7505 -0.91695 -1.75 0.0794
HH Income (Thous. $)       0.02319 8.2 <.0001      
Nat. Log. (HH Income)             0.89309 6.42 <.0001
Count of HH Vehicles       0.88736 6.26 <.0001      
Count of HH Members 0.57181 5.73 <.0001 1.11439 8.3 <.0001 1.30364 12.93 <.0001
Homeowner 1.13807 6.68 <.0001            
Number of Workers 2.39878 19019 <.0001 0.65079 3.62 0.0003 1.52474 9.9 <.0001
Life Cycle (1+C <18) 3.13979 11.35 <.0001 4.70914 12.15 <.0001 3.36804 10.32 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+) 1.3544 4.93 <.0001            
Life Cycle (2+P hh, 1+ 65+) 2.49626 8.68 <.0001 3.15272 9.78 <.0001 1.29406 4.56 <.0001
Adj. R-Sq 0.4364     0.4502     0.4342    
F Value 373.06     199.54     281.15    
Obser. Used 2,884     1,456     1,826    


Table A12. Household Number of Person Trips, Pacific Division

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -0.01104 -0.05 0.9582 -0.52982 -1.28 0.2001 0.01978 0.05 0.9609
HH Income (Thous. $)                  
Nat. Log. (HH Income) 0.53034 8.95 <.0001 1.10725 10.17 <.0001 0.56695 5.36 <.0001
Count of HH Vehicles 0.33626 6.52 <.0001       0.22771 2.68 0.0074
Count of HH Members 0.93716 20.86 <.0001       0.5919 6.63 <.0001
Homeowner 0.41928 3.84 <.0001       0.45391 2.22 0.0262
Number of Workers 1.56371 22.82 <.0001 1.53805 11.59 <.0001 1.63079 14.46 <.0001
Life Cycle (1+C <18) 4.8236 33.53 <.0001 6.59061 26.04 <.0001 3.76355 15.29 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)       1.4452 5.11 <.0001 1.07387 3.68 0.0003
Life Cycle (2+P hh, 1+ 65+) 0.87963 6.65 <.0001 2.77928 9.13 <.0001 2.42387 7.7 <.0001
Adj. R-Sq 0.4596     0.4335     0.3692    
F Value 1099.92     367.5     240.41    
Obser. Used 9,046     2,396     3,274    


Table A13. Household Vehicle Miles Traveled, Northeast Region

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -6.86996 -6.44 <.0001 -10.56755 -4.76 <.0001 -4.6559 -2.72 0.0066
HH Income (Thous. $) 0.08287 5.41 <.0001 0.20645 10.95 <.0001 0.08772 5.75 <.0001
Nat. Log. (HH Income)                  
Count of HH Vehicles 17.50154 25.81 <.0001 10.26131 11.72 <.0001 6.55524 10.63 <.0001
Count of HH Members       2.8621 4.04 <.0001 3.57181 5.61 <.0001
Homeowner             9.20604 5.6 <.0001
Number of Workers 5.82215 7.08 <.0001 15.70948 13.62 <.0001 17.18424 18.35 <.0001
Life Cycle (1+C <18)                  
Life Cycle (1P hh <65)       7.23785 2.7 0.0069      
Life Cycle (2+P hh, 0 65+)             7.96681 4.65 <.0001
Life Cycle (2+P hh, 1+ 65+)                  
Adj. R-Sq 0.2922     0.308     0.2675    
F Value 527.48     306.32     355.58    
Obser. Used 3,827     3,431     5,828    


Table A14. Household Vehicle Miles Traveled, Midwest Region

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -19.18071 -6.02 <.0001 -24.23894 -7 <.0001 -0.61707 -0.33 0.745
HH Income (Thous. $)             0.19803 9.49 <.0001
Nat. Log. (HH Income) 4.5349 4.78 <.0001 7.59239 7.55 <.0001      
Count of HH Vehicles 10.48334 12.14 <.0001 8.96073 10.21 <.0001 6.76393 10.15 <.0001
Count of HH Members 2.72159 4.89 <.0001 1.94928 2.21 0.0269      
Homeowner             5.28513 2.73 0.0063
Number of Workers 11.95444 10.37 <.0001 12.15805 10.54 <.0001 14.46571 13.49 <.0001
Life Cycle (1+C <18)       8.67894 3.47 0.0005 9.63198 5.06  
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)             7.77804 3.47 0.0005
Life Cycle (2+P hh, 1+ 65+) 6.26766 2.66 0.0079 5.6133 2.72 0.0066 8.68607 3.52 0.0004
Adj. R-Sq 0.2605     0.2903     0.2451    
F Value 183.24     186.37     222.37    
Obser. Used 2,588     2,720     4,773    


Table A15. Household Vehicle Miles Traveled, South Atlantic Division

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -9.78156 -6.14 <.0001 -20.85206 -12.04 <.0001 -16.40231 -10.42 <.0001
HH Income (Thous. $)                  
Nat. Log. (HH Income) 2.85873 5.5 <.0001 4.24703 8.4 <.0001 6.18434 13.77 <.0001
Count of HH Vehicles 11.70642 21.36 <.0001 8.13201 16.95 <.0001 7.86132 20.9 <.0001
Count of HH Members       3.17507 7.29 <.0001 3.16748 8.2 <.0001
Homeowner 2.44253 2.52 0.0118 10.92742 11.47 <.0001 4.65386 5.02 <.0001
Number of Workers 11.46791 17.1 <.0001 14.3461 24.43 <.0001 19.26313 37.13 <.0001
Life Cycle (1+C <18)       7.81305 6.34 <.0001 3.66921 3.29 0.001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+) 2.06335 2.02 0.0432 2.42967 2.31 0.0209      
Life Cycle (2+P hh, 1+ 65+)                  
Adj. R-Sq 0.2535     0.276     0.268    
F Value 466.99     651.22     1055.17    
Obser. Used 6,861     11,938     17,281    


Table A16. Household Vehicle Miles Traveled, South Central Divisions

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -3.01622 -2.34 0.0195 1.36779 0.7 0.4833 2.28456 1.46 0.1452
HH Income (Thous. $) 0.11057 7.89 <.0001 0.04989 2.67 0.0077 0.08266 5.29 <.0001
Nat. Log. (HH Income)                  
Count of HH Vehicles 8.70204 13.56 <.0001 11.17887 12.96 <.0001 8.17316 14.72 <.0001
Count of HH Members 1.54016 3.74 0.0002            
Homeowner             7.97223 5.5 <.0001
Number of Workers 14.29586 18.16 <.0001 8.73603 7.59 <.0001 17.25116 20.02 <.0001
Life Cycle (1+C <18)       13.41715 6.67 <.0001 6.43454 4.3 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)       12.50158 5.93 <.0001 6.78381 4.37 <.0001
Life Cycle (2+P hh, 1+ 65+) 3.641 2.53 0.0114            
Adj. R-Sq 0.2294     0.1837     0.2257    
F Value 337.75     154.2     312.25    
Obser. Used 5,657     4,086     7,477    


Table A17. Household Vehicle Miles Traveled, Mountain Division

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -4.84096 -3.49 0.0005 -4.59235 -1.65 0.0997 -19.87899 -5 <.0001
HH Income (Thous. $) 0.19498 10.88 <.0001       0.25934 8.4 <.0001
Nat. Log. (HH Income)                  
Count of HH Vehicles 5.1668 7.41 <.0001 16.04391 13.43 <.0001 1.65341 2.08 0.038
Count of HH Members             7.73185 8.87 <.0001
Homeowner 8.20199 5.84 <.0001       14.51037 4.94 <.0001
Number of Workers 7.65617 8.01 <.0001 6.47233 4.14 <.0001 17.04663 10.1 <.0001
Life Cycle (1+C <18)       32.87826 10.8 <.0001      
Life Cycle (1P hh <65)       7.82038 2.63 0.0086 11.09396 2.7 0.007
Life Cycle (2+P hh, 0 65+) 8.3576 4.66 <.0001            
Life Cycle (2+P hh, 1+ 65+) 11.37603 5.3 <.0001            
Adj. R-Sq 0.2875     0.248     0.2485    
F Value 179.98     132.35     101.75    
Obser. Used 2,662     1,594     1,829    


Table A18. Household Vehicle Miles Traveled, Pacific Division

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -20.33475 -12.53 <.0001 -14.41003 -4.03 <.0001 -1.53903 -0.72 0.4728
HH Income (Thous. $)             0.11949 6.55 <.0001
Nat. Log. (HH Income) 6.71435 13.67 <.0001 5.27427 5.19 <.0001      
Count of HH Vehicles 7.63711 18.37 <.0001 2.6659 3.11 0.0019 6.26931 8.51 <.0001
Count of HH Members             3.24356 5.67 <.0001
Homeowner 2.71994 2.99 0.0028 7.32152 3.35 0.0008 4.49841 2.53 0.0113
Number of Workers 12.02393 21.66 <.0001 16.39064 14.09 <.0001 12.17018 12.57 <.0001
Life Cycle (1+C <18) 5.63397 5.94 <.0001 9.69012 4.38 <.0001      
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)       5.1382 2.03 0.0426      
Life Cycle (2+P hh, 1+ 65+) 3.41122 3.12 0.0018 10.49814 3.8 0.0001      
Adj. R-Sq 0.2462     0.2278     0.2016    
F Value 494.18     101.91     165.74    
Obser. Used 9,060     2,396     3,264    


Table A19. Household Number of Vehicle Trips, Northeast Region

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -0.66313 -3.31 0.0009 -1.6531 -6.49 <.0001 -1.02396 -5.13 <.0001
HH Income (Thous. $)                  
Nat. Log. (HH Income) 0.33738 5.19 <.0001 0.59534 7.96 <.0001 0.61957 10.68 <.0001
Count of HH Vehicles 1.93847 30.53 <.0001 0.8738 14.4 <.0001 0.55186 12.65 <.0001
Count of HH Members       0.52968 11.99 <.0001 0.16112 3.11 0.0019
Homeowner 0.3558 2.87 0.0041 1.00187 7 <.0001 0.6449 5.63 <.0001
Number of Workers 0.42257 5.8 <.0001 0.79548 10.05 <.0001 1.42602 22.19 <.0001
Life Cycle (1+C <18) 0.59515 4.53 <.0001       1.44103 9.92 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)                  
Life Cycle (2+P hh, 1+ 65+) 0.33315 2.4 0.0163 0.50731 3.57 0.0004 0.80326 6.66 <.0001
Adj. R-Sq 0.3983     0.3938     0.3509    
F Value 423.38     373.19     454    
Obser. Used 3,830     3,439     5,866    


Table A20. Household Number of Vehicle Trips, Midwest Region

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -1.72506 -6.25 <.0001 -1.85189 -6.53 <.0001 1.29949 10.38 <.0001
HH Income (Thous. $)             0.0151 10.75 <.0001
Nat. Log. (HH Income) 0.70221 8.26 <.0001 0.66274 7.53 <.0001      
Count of HH Vehicles 0.86441 11.7 <.0001 0.70326 9.19 <.0001 0.30531 6.81 <.0001
Count of HH Members 0.15307 2.62 0.0089 0.55573 10.57 <.0001      
Homeowner 0.76582 5.1 <.0001 0.79666 5.13 <.0001 0.65505 4.96 <.0001
Number of Workers 1.39714 14.45 <.0001 1.37442 14.28 <.0001 1.46809 20.57 <.0001
Life Cycle (1+C <18) 1.40195 6.84 <.0001       1.60507 12.99 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)                  
Life Cycle (2+P hh, 1+ 65+) 1.60838 7.96 <.0001 1.24843 7.4 <.0001 1.13632 7.82 <.0001
Adj. R-Sq 0.4163     0.4073     0.307    
F Value 264.83     314.07     355.79    
Obser. Used 2,590     2,734     4,806    


Table A21. Household Number of Vehicle Trips, South Atlantic Division

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -0.23425 -1.63 0.104 -0.77587 -5.69 <.0001 0.1123 1.02 <.0001
HH Income (Thous. $)                  
Nat. Log. (HH Income) 0.18431 4.23 <.0001 0.50515 12.7 <.0001 0.42383 13.52 <.0001
Count of HH Vehicles 1.26723 26.72 <.0001 0.7864 20.88 <.0001 0.47983 18.23 <.0001
Count of HH Members 0.1375 3.5 0.0005 0.20773 6.19 <.0001 0.25972 9.53 <.0001
Homeowner 0.6039 7.43 <.0001 0.68862 9.11 <.0001 0.19854 3.04 0.0024
Number of Workers 1.11611 20.01 <.0001 1.14759 24.62 <.0001 1.50236 40.12 <.0001
Life Cycle (1+C <18) 0.67302 5.81 <.0001 1.78086 17.92 <.0001 0.54131 6.81 <.0001
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)                  
Life Cycle (2+P hh, 1+ 65+) 0.45469 4.49 <.0001 0.50312 5.83 <.0001 0.47454 6.84 <.0001
Adj. R-Sq 0.3674     0.3377     0.2837    
F Value 571.4     876.13     988.52    
Obser. Used 6,877     12,013     17,452    


Table A22. Household Number of Vehicle Trips, South Central Divisions

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -0.88836 -4.96 <.0001 -0.71267 -3.18 0.0015 0.15958 0.96 0.3391
HH Income (Thous. $)                  
Nat. Log. (HH Income) 0.67469 12.56 <.0001 0.42893 6.83 <.0001 0.45838 8.97 <.0001
Count of HH Vehicles 0.86313 15.87 <.0001 0.7824 12.04 <.0001 0.49584 12.61 <.0001
Count of HH Members 0.12786 3 0.0027 0.14053 2.21 0.0272 0.22828 5.47 <.0001
Homeowner 0.35853 3.45 0.0006 1.0005 7.67 <.0001 0.33645 3.29 0.001
Number of Workers 1.18915 18.37 <.0001 1.51422 18.4 <.0001 1.32624 22.28 <.0001
Life Cycle (1+C <18) 1.15433 8.28 <.0001 1.45215 8.66 <.0001 1.36769 10.57 <.0001
Life Cycle (1P hh <65)       0.49754 3.22 0.0013      
Life Cycle (2+P hh, 0 65+)                  
Life Cycle (2+P hh, 1+ 65+) 0.37434 3.16 0.0016 0.727 4.54 <.0001      
Adj. R-Sq 0.348     0.3625     0.2938    
F Value 432.79     293.27     525.88    
Obser. Used 5,665     4,112     7,572    


Table A23. Household Number of Vehicle Trips, Mountain Division

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept 1.03096 7.94 <.0001 -2.54403 -6.26 <.0001 -0.79473 -1.99 0.0464
HH Income (Thous. $)                  
Nat. Log. (HH Income)       0.87516 7.88 <.0001 1.01674 9.35 <.0001
Count of HH Vehicles 0.72474 10.99 <.0001 0.92633 8.63 <.0001      
Count of HH Members       0.46268 4.7 <.0001 0.38109 5.19 <.0001
Homeowner       0.42888 2.05 0.0409      
Number of Workers 1.86925 19.5 <.0001 0.5723 4.09 <.0001 1.30981 11.3 <.0001
Life Cycle (1+C <18)       1.62607 5.53 <.0001 0.91001 3.72 0.0002
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+) 1.05868 5.88 <.0001            
Life Cycle (2+P hh, 1+ 65+) 1.45383 6.96 <.0001 1.64595 6.75 <.0001      
Adj. R-Sq 0.3363     0.3559     0.2675    
F Value 367.62     116.34     169.5    
Obser. Used 2,895     1,462     1,847    


Table A24. Household Number of Vehicle Trips, Pacific Division

  Urban Suburban Rural
Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t| Parameter Estimate t value Pr>|t|
Intercept -1.2622 -8.22 <.0001 -0.93007 -3.04 0.0024 -0.94625 -3.29 0.001
HH Income (Thous. $)                  
Nat. Log. (HH Income) 0.60724 14.05 <.0001 0.99509 12.37 <.0001 0.70834 9.12 <.0001
Count of HH Vehicles 0.88442 23.41 <.0001       0.46105 7.42 <.0001
Count of HH Members 0.07045 2.15 0.0313       0.48858 10.24 <.0001
Homeowner 0.60889 7.65 <.0001       0.50116 3.41 0.0007
Number of Workers 1.15723 23.11 <.0001 1.44618 14.5 <.0001 0.95885 11.93 <.0001
Life Cycle (1+C <18) 1.33365 12.69 <.0001 1.52984 8.17 <.0001      
Life Cycle (1P hh <65)                  
Life Cycle (2+P hh, 0 65+)       0.42489 2.02 0.0431      
Life Cycle (2+P hh, 1+ 65+) 0.66618 6.9 <.0001 0.93432 4.13 <.0001      
Adj. R-Sq 0.3561     0.2726     0.2511    
F Value 718.15     181.41     221.54    
Obser. Used 9,077     2,408     3,289