Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 37,494 1996 0 1996 1996 state | 37,494 27.57548 16.10687 1 56 county | 37,494 89.86699 95.31105 0 999 fatals | 37,494 1.121913 .4215837 1 8 st_case | 37,494 276491.5 160975.6 10001 560121 -------------+--------------------------------------------------------- a_crainj | 37,494 1 0 1 1 a_region | 37,494 5.319891 2.37213 1 10 a_ru | 37,494 1.432149 .5019602 1 3 a_inter | 37,494 1.892063 .3466802 1 3 a_relrd | 37,494 2.074305 1.398234 1 6 -------------+--------------------------------------------------------- a_intsec | 37,494 1.76991 .4271858 1 3 a_roadfc | 37,494 3.923908 1.586708 1 7 a_junc | 37,494 1.821785 .5093521 1 4 a_mancol | 37,494 2.016269 1.314231 1 7 a_rd | 37,494 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 37,494 1.52099 .5166778 1 3 a_dow | 37,494 1.414306 .4980469 1 3 a_hr | 37,494 1.962181 .1907618 1 2 a_ct | 37,494 1.503734 .6203154 1 3 a_lt | 37,494 1.882301 .3222555 1 2 -------------+--------------------------------------------------------- a_mc | 37,494 1.943484 .230918 1 2 a_spcra | 37,494 1.693738 .4609462 1 2 a_ped | 37,494 1.854563 .3525452 1 2 a_pedal | 37,494 1.97941 .142009 1 2 a_roll | 37,494 1.734998 .4413404 1 2 -------------+--------------------------------------------------------- a_polpur | 37,494 1.991732 .090553 1 2 a_posbac | 37,494 2.284846 .8549615 1 3 a_d15_19 | 37,494 1.832293 .3736107 1 2 a_d16_19 | 37,494 1.838507 .3679895 1 2 a_d15_20 | 37,494 1.794047 .4044017 1 2 -------------+--------------------------------------------------------- a_d16_20 | 37,494 1.800208 .3998492 1 2 a_d65pls | 37,494 1.838267 .3682102 1 2 a_d21_24 | 37,494 1.841068 .3656176 1 2 a_d16_24 | 37,494 1.653305 .4759241 1 2 a_dist | 37,494 1.901451 .2980596 1 2 -------------+--------------------------------------------------------- a_drowsy | 37,494 1.962101 .1909555 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016