Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 39,196 1985 0 1985 1985 state | 39,196 27.64841 16.0433 1 56 county | 39,196 87.69892 96.90158 1 997 fatals | 39,196 1.118099 .4214652 0 9 st_case | 39,196 277315.7 160260.1 10002 560136 -------------+--------------------------------------------------------- a_crainj | 39,196 1 0 1 1 a_region | 39,196 5.258215 2.475298 1 10 a_ru | 39,196 1.442775 .4980545 1 3 a_inter | 39,196 1.911037 .3000525 1 3 a_relrd | 39,196 2.051612 1.390458 1 6 -------------+--------------------------------------------------------- a_intsec | 39,196 1.794903 .4051657 1 3 a_roadfc | 39,196 3.987983 1.49293 1 7 a_junc | 39,196 1.850291 .4902287 1 4 a_mancol | 39,196 1.942086 1.26828 1 7 a_rd | 39,196 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 39,196 1.574702 .5090901 1 3 a_dow | 39,196 1.441703 .5007914 1 3 a_hr | 39,196 1.958185 .2001699 1 2 a_ct | 39,196 1.469257 .5956417 1 3 a_lt | 39,196 1.876492 .329023 1 2 -------------+--------------------------------------------------------- a_mc | 39,196 1.885499 .3184234 1 2 a_spcra | 39,196 1.650015 .4769709 1 2 a_ped | 39,196 1.828069 .3773251 1 2 a_pedal | 39,196 1.977472 .1483943 1 2 a_roll | 39,196 1.773854 .4183398 1 2 -------------+--------------------------------------------------------- a_polpur | 39,196 1.993851 .0781725 1 2 a_posbac | 39,196 2.249209 .9021204 1 3 a_d15_19 | 39,196 1.819089 .3849496 1 2 a_d16_19 | 39,196 1.825416 .3796159 1 2 a_d15_20 | 39,196 1.7674 .4224949 1 2 -------------+--------------------------------------------------------- a_d16_20 | 39,196 1.773472 .4185901 1 2 a_d65pls | 39,196 1.890091 .3127805 1 2 a_d21_24 | 39,196 1.780641 .4138177 1 2 a_d16_24 | 39,196 1.574268 .4944598 1 2 a_dist | 39,196 1.899607 .300527 1 2 -------------+--------------------------------------------------------- a_drowsy | 39,196 1.970252 .1698933 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016