Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 37,862 2001 0 2001 2001 state | 37,862 27.59513 16.15352 1 56 county | 37,862 90.15665 94.97455 0 999 fatals | 37,862 1.114468 .4110763 1 11 st_case | 37,862 276697.1 161446.3 10001 560155 -------------+--------------------------------------------------------- a_crainj | 37,862 1 0 1 1 a_region | 37,862 5.29214 2.370257 1 10 a_ru | 37,862 1.415245 .4958698 1 3 a_inter | 37,862 1.881438 .3566087 1 3 a_relrd | 37,862 2.10562 1.391608 1 6 -------------+--------------------------------------------------------- a_intsec | 37,862 1.776531 .4216176 1 3 a_roadfc | 37,862 3.939649 1.623784 1 7 a_junc | 37,862 1.826132 .500559 1 4 a_mancol | 37,862 1.995325 1.307365 1 7 a_rd | 37,862 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 37,862 1.511436 .5152273 1 3 a_dow | 37,862 1.422059 .4990548 1 3 a_hr | 37,862 1.961571 .1922322 1 2 a_ct | 37,862 1.5014 .6237303 1 3 a_lt | 37,862 1.882441 .3220889 1 2 -------------+--------------------------------------------------------- a_mc | 37,862 1.916882 .2760636 1 2 a_spcra | 37,862 1.702393 .4572118 1 2 a_ped | 37,862 1.871454 .3347009 1 2 a_pedal | 37,862 1.980508 .1382476 1 2 a_roll | 37,862 1.722862 .4475911 1 2 -------------+--------------------------------------------------------- a_polpur | 37,862 1.991627 .0911188 1 2 a_posbac | 37,862 2.299139 .8408993 1 3 a_d15_19 | 37,862 1.837542 .3688757 1 2 a_d16_19 | 37,862 1.84182 .3649142 1 2 a_d15_20 | 37,862 1.794279 .4042327 1 2 -------------+--------------------------------------------------------- a_d16_20 | 37,862 1.798558 .4010828 1 2 a_d65pls | 37,862 1.839522 .3670532 1 2 a_d21_24 | 37,862 1.846812 .3601733 1 2 a_d16_24 | 37,862 1.658048 .47437 1 2 a_dist | 37,862 1.892716 .3094785 1 2 -------------+--------------------------------------------------------- a_drowsy | 37,862 1.967725 .1767321 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016