Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 37,107 1998 0 1998 1998 state | 37,107 27.90393 15.96146 1 56 county | 37,107 89.52319 93.5379 0 999 fatals | 37,107 1.118414 .421735 1 8 st_case | 37,107 279736.2 159557.7 10001 560129 -------------+--------------------------------------------------------- a_crainj | 37,107 1 0 1 1 a_region | 37,107 5.270515 2.346469 1 10 a_ru | 37,107 1.408656 .4965015 1 3 a_inter | 37,107 1.889859 .3573671 1 3 a_relrd | 37,107 2.074757 1.390428 1 6 -------------+--------------------------------------------------------- a_intsec | 37,107 1.769612 .426176 1 3 a_roadfc | 37,107 3.930337 1.605041 1 7 a_junc | 37,107 1.818633 .5035153 1 4 a_mancol | 37,107 2.015577 1.312357 1 7 a_rd | 37,107 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 37,107 1.508907 .5171506 1 3 a_dow | 37,107 1.413507 .4968816 1 3 a_hr | 37,107 1.962864 .1890972 1 2 a_ct | 37,107 1.504002 .6200567 1 3 a_lt | 37,107 1.8766 .3289001 1 2 -------------+--------------------------------------------------------- a_mc | 37,107 1.939311 .2387628 1 2 a_spcra | 37,107 1.701539 .4575891 1 2 a_ped | 37,107 1.85946 .3475506 1 2 a_pedal | 37,107 1.979438 .1419151 1 2 a_roll | 37,107 1.727895 .4450497 1 2 -------------+--------------------------------------------------------- a_polpur | 37,107 1.992562 .0859234 1 2 a_posbac | 37,107 2.31428 .8397893 1 3 a_d15_19 | 37,107 1.833778 .3722848 1 2 a_d16_19 | 37,107 1.839195 .3673562 1 2 a_d15_20 | 37,107 1.794244 .4042587 1 2 -------------+--------------------------------------------------------- a_d16_20 | 37,107 1.799499 .4003808 1 2 a_d65pls | 37,107 1.830113 .3755386 1 2 a_d21_24 | 37,107 1.853532 .3535799 1 2 a_d16_24 | 37,107 1.66505 .4719794 1 2 a_dist | 37,107 1.889778 .3131702 1 2 -------------+--------------------------------------------------------- a_drowsy | 37,107 1.96246 .1900837 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016