Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 30,196 2010 0 2010 2010 state | 30,196 27.95364 16.11781 1 56 st_case | 30,196 280128.6 161143 10001 560139 county | 30,196 91.09322 94.529 1 820 fatals | 30,196 1.089052 .3581678 1 11 -------------+--------------------------------------------------------- a_crainj | 30,196 1 0 1 1 a_region | 30,196 5.206219 2.338323 1 10 a_ru | 30,196 1.470261 .5183915 1 3 a_inter | 30,196 1.889588 .3538114 1 3 a_relrd | 30,196 2.23215 1.436203 1 6 -------------+--------------------------------------------------------- a_intsec | 30,196 1.768976 .4271145 1 3 a_roadfc | 30,196 3.94443 1.623339 1 7 a_junc | 30,196 1.836468 .5303968 1 4 a_mancol | 30,196 1.937806 1.339741 1 7 a_tod | 30,196 1.519936 .5145023 1 3 -------------+--------------------------------------------------------- a_dow | 30,196 1.41734 .4968748 1 3 a_ct | 30,196 1.45814 .6058742 1 3 a_lt | 30,196 1.892006 .3103785 1 2 a_mc | 30,196 1.853524 .353589 1 2 a_spcra | 30,196 1.689826 .4625722 1 2 -------------+--------------------------------------------------------- a_ped | 30,196 1.858524 .3485173 1 2 a_pedal | 30,196 1.979302 .142374 1 2 a_roll | 30,196 1.731753 .4430545 1 2 a_polpur | 30,196 1.9898 .1004804 1 2 a_posbac | 30,196 2.253378 .8360246 1 3 -------------+--------------------------------------------------------- a_d15_19 | 30,196 1.887469 .3160244 1 2 a_d16_19 | 30,196 1.890582 .3121687 1 2 a_d15_20 | 30,196 1.853524 .353589 1 2 a_d16_20 | 30,196 1.85657 .3505162 1 2 a_d65pls | 30,196 1.826765 .3784565 1 2 -------------+--------------------------------------------------------- a_d21_24 | 30,196 1.853656 .3534565 1 2 a_d16_24 | 30,196 1.718506 .4497354 1 2 a_rd | 30,196 1.477216 .4994889 1 2 a_hr | 30,196 1.955988 .2051262 1 2 a_dist | 30,196 1.905848 .2920443 1 2 -------------+--------------------------------------------------------- a_drowsy | 30,196 1.975162 .155633 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016