Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 463 1991 0 1991 1991 state | 463 43 0 43 43 county | 463 72 0 72 72 fatals | 463 1.069114 .2859946 1 3 st_case | 463 430237 136.2631 430001 430474 -------------+--------------------------------------------------------- a_crainj | 463 1 0 1 1 a_region | 463 2 0 2 2 a_ru | 463 1.488121 .5003995 1 2 a_inter | 463 1.781857 .4134314 1 2 a_relrd | 463 1.928726 1.369621 1 4 -------------+--------------------------------------------------------- a_intsec | 463 1.928726 .2575608 1 2 a_roadfc | 463 4.228942 1.921474 1 6 a_junc | 463 1.930886 .2623088 1 3 a_mancol | 463 1.678186 1.131074 1 5 a_rd | 463 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 463 1.637149 .4858184 1 3 a_dow | 463 1.492441 .5004836 1 2 a_hr | 463 1.952484 .2129704 1 2 a_ct | 463 1.352052 .5614136 1 3 a_lt | 463 1.917927 .2747735 1 2 -------------+--------------------------------------------------------- a_mc | 463 1.941685 .2345922 1 2 a_spcra | 463 1.557235 .4972506 1 2 a_ped | 463 1.62851 .4837258 1 2 a_pedal | 463 1.971922 .1653737 1 2 a_roll | 463 1.948164 .2219353 1 2 -------------+--------------------------------------------------------- a_polpur | 463 1.99784 .0464739 1 2 a_posbac | 463 2.006479 .8098161 1 3 a_d15_19 | 463 1.885529 .3187267 1 2 a_d16_19 | 463 1.889849 .3134168 1 2 a_d15_20 | 463 1.850972 .3565013 1 2 -------------+--------------------------------------------------------- a_d16_20 | 463 1.855292 .3521872 1 2 a_d65pls | 463 1.939525 .2386229 1 2 a_d21_24 | 463 1.818575 .3857872 1 2 a_d16_24 | 463 1.682505 .4660052 1 2 a_dist | 463 1.99784 .0464739 1 2 -------------+--------------------------------------------------------- a_drowsy | 463 1.99784 .0464739 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016