Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 505 1984 0 1984 1984 state | 505 43 0 43 43 county | 505 72 0 72 72 fatals | 505 1.079208 .3853253 1 6 st_case | 505 430254.5 147.1699 430001 430508 -------------+--------------------------------------------------------- a_crainj | 505 1 0 1 1 a_region | 505 2 0 2 2 a_ru | 505 1.50099 .5004948 1 2 a_inter | 505 2 0 2 2 a_relrd | 505 1.756436 1.259127 1 6 -------------+--------------------------------------------------------- a_intsec | 505 1.788119 .4090463 1 2 a_roadfc | 505 3.920792 1.396447 2 6 a_junc | 505 1.792079 .4158762 1 3 a_mancol | 505 1.605941 1.064005 1 6 a_rd | 505 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 505 1.633663 .4904398 1 3 a_dow | 505 1.528713 .4996699 1 2 a_hr | 505 1.845545 .3617431 1 2 a_ct | 505 1.344554 .5528561 1 3 a_lt | 505 1.956436 .2043261 1 2 -------------+--------------------------------------------------------- a_mc | 505 1.940594 .2366173 1 2 a_spcra | 505 1.530693 .4995519 1 2 a_ped | 505 1.578218 .4943338 1 2 a_pedal | 505 1.966337 .18054 1 2 a_roll | 505 1.90297 .2962917 1 2 -------------+--------------------------------------------------------- a_polpur | 505 2 0 2 2 a_posbac | 505 2.253465 .923198 1 3 a_d15_19 | 505 1.906931 .2908176 1 2 a_d16_19 | 505 1.908911 .2880211 1 2 a_d15_20 | 505 1.855446 .3519997 1 2 -------------+--------------------------------------------------------- a_d16_20 | 505 1.857426 .3499848 1 2 a_d65pls | 505 1.942574 .232885 1 2 a_d21_24 | 505 1.821782 .3830755 1 2 a_d16_24 | 505 1.69703 .4599982 1 2 a_dist | 505 2 0 2 2 -------------+--------------------------------------------------------- a_drowsy | 505 1.99604 .0628692 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016