Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 35,780 1993 0 1993 1993 state | 35,780 27.43379 16.02808 1 56 county | 35,780 87.25103 92.28725 0 999 fatals | 35,780 1.122135 .4237383 1 9 st_case | 35,780 275053.5 160142.2 10001 560101 -------------+--------------------------------------------------------- a_crainj | 35,780 1 0 1 1 a_region | 35,780 5.249357 2.416123 1 10 a_ru | 35,780 1.437228 .5093939 1 3 a_inter | 35,780 1.912884 .35478 1 3 a_relrd | 35,780 2.058385 1.386138 1 6 -------------+--------------------------------------------------------- a_intsec | 35,780 1.781302 .4173389 1 3 a_roadfc | 35,780 3.99687 1.596637 1 7 a_junc | 35,780 1.835774 .5026832 1 4 a_mancol | 35,780 1.98052 1.293198 1 7 a_rd | 35,780 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 35,780 1.536613 .5135204 1 3 a_dow | 35,780 1.429402 .4988785 1 3 a_hr | 35,780 1.959307 .1975811 1 2 a_ct | 35,780 1.483315 .60507 1 3 a_lt | 35,780 1.885383 .3185637 1 2 -------------+--------------------------------------------------------- a_mc | 35,780 1.932364 .251123 1 2 a_spcra | 35,780 1.693795 .4609222 1 2 a_ped | 35,780 1.843432 .363398 1 2 a_pedal | 35,780 1.977194 .1492868 1 2 a_roll | 35,780 1.752376 .4316384 1 2 -------------+--------------------------------------------------------- a_polpur | 35,780 1.991783 .0902751 1 2 a_posbac | 35,780 2.263974 .8718715 1 3 a_d15_19 | 35,780 1.840022 .3665904 1 2 a_d16_19 | 35,780 1.84578 .3611648 1 2 a_d15_20 | 35,780 1.800168 .3998798 1 2 -------------+--------------------------------------------------------- a_d16_20 | 35,780 1.805813 .3955788 1 2 a_d65pls | 35,780 1.845752 .3611915 1 2 a_d21_24 | 35,780 1.828591 .3768709 1 2 a_d16_24 | 35,780 1.647373 .4777945 1 2 a_dist | 35,780 1.905506 .292519 1 2 -------------+--------------------------------------------------------- a_drowsy | 35,780 1.961906 .1914257 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016