Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 34,172 2008 0 2008 2008 state | 34,172 27.52367 16.2071 1 56 county | 34,172 90.8068 95.50772 1 820 fatals | 34,172 1.095136 .3789751 1 17 st_case | 34,172 275938.2 161988.7 10001 560139 -------------+--------------------------------------------------------- a_crainj | 34,172 1 0 1 1 a_region | 34,172 5.277742 2.354066 1 10 a_ru | 34,172 1.454407 .5095433 1 3 a_inter | 34,172 1.887598 .3446631 1 3 a_relrd | 34,172 2.15539 1.387124 1 6 -------------+--------------------------------------------------------- a_intsec | 34,172 1.782951 .4153541 1 3 a_roadfc | 34,172 3.963889 1.615886 1 7 a_junc | 34,172 1.838757 .5017761 1 4 a_mancol | 34,172 1.956719 1.342984 1 7 a_tod | 34,172 1.531224 .5138247 1 3 -------------+--------------------------------------------------------- a_dow | 34,172 1.426372 .4985054 1 3 a_hr | 34,172 1.953734 .2100636 1 2 a_ct | 34,172 1.455695 .6063645 1 3 a_lt | 34,172 1.890144 .3127148 1 2 a_mc | 34,172 1.847126 .359871 1 2 -------------+--------------------------------------------------------- a_spcra | 34,172 1.691648 .4618195 1 2 a_ped | 34,172 1.871854 .334257 1 2 a_pedal | 34,172 1.978901 .143717 1 2 a_roll | 34,172 1.72296 .4475428 1 2 a_polpur | 34,172 1.991455 .0920448 1 2 -------------+--------------------------------------------------------- a_posbac | 34,172 2.192672 .852628 1 3 a_d15_19 | 34,172 1.873112 .3328518 1 2 a_d16_19 | 34,172 1.8768 .3286718 1 2 a_d15_20 | 34,172 1.834631 .371519 1 2 a_d16_20 | 34,172 1.838259 .3682181 1 2 -------------+--------------------------------------------------------- a_d65pls | 34,172 1.845458 .3614726 1 2 a_d21_24 | 34,172 1.849497 .3575693 1 2 a_d16_24 | 34,172 1.69753 .4593343 1 2 a_rd | 34,172 1.476355 .4994479 1 2 a_dist | 34,172 1.844697 .3621982 1 2 -------------+--------------------------------------------------------- a_drowsy | 34,172 1.978169 .1461328 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016