Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 37,241 1995 0 1995 1995 state | 37,241 27.2135 16.04961 1 56 county | 37,241 86.93829 89.58912 1 840 fatals | 37,241 1.122875 .4345981 1 10 st_case | 37,241 272858.9 160354 10001 560138 -------------+--------------------------------------------------------- a_crainj | 37,241 1 0 1 1 a_region | 37,241 5.307672 2.394793 1 10 a_ru | 37,241 1.435703 .5059339 1 3 a_inter | 37,241 1.896163 .3273048 1 3 a_relrd | 37,241 2.077468 1.398456 1 6 -------------+--------------------------------------------------------- a_intsec | 37,241 1.774254 .4246422 1 3 a_roadfc | 37,241 3.95795 1.565849 1 7 a_junc | 37,241 1.829999 .5122748 1 4 a_mancol | 37,241 1.997127 1.305864 1 7 a_rd | 37,241 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 37,241 1.52649 .5175263 1 3 a_dow | 37,241 1.425606 .4998964 1 3 a_hr | 37,241 1.961494 .1924168 1 2 a_ct | 37,241 1.493703 .6152985 1 3 a_lt | 37,241 1.887382 .3161293 1 2 -------------+--------------------------------------------------------- a_mc | 37,241 1.940684 .236219 1 2 a_spcra | 37,241 1.688139 .4632595 1 2 a_ped | 37,241 1.851132 .3559633 1 2 a_pedal | 37,241 1.977552 .1481386 1 2 a_roll | 37,241 1.73787 .4397991 1 2 -------------+--------------------------------------------------------- a_polpur | 37,241 1.991327 .0927267 1 2 a_posbac | 37,241 2.266883 .8611817 1 3 a_d15_19 | 37,241 1.835316 .3709002 1 2 a_d16_19 | 37,241 1.841841 .3648949 1 2 a_d15_20 | 37,241 1.794903 .4037776 1 2 -------------+--------------------------------------------------------- a_d16_20 | 37,241 1.801375 .3989705 1 2 a_d65pls | 37,241 1.84168 .3650458 1 2 a_d21_24 | 37,241 1.838619 .3678872 1 2 a_d16_24 | 37,241 1.653097 .4759908 1 2 a_dist | 37,241 1.910233 .285851 1 2 -------------+--------------------------------------------------------- a_drowsy | 37,241 1.961387 .1926742 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016