Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 22 Oct 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 32,166 2015 0 2015 2015 state | 32,166 27.60477 16.25517 1 56 st_case | 32,166 276729.6 162486.3 10001 560130 county | 32,166 91.22505 94.67032 1 999 fatals | 32,166 1.090966 .3657935 1 10 -------------+--------------------------------------------------------- a_crainj | 32,166 1 0 1 1 a_region | 32,166 5.332587 2.34982 1 10 a_ru | 32,166 1.601007 .6266611 1 3 a_inter | 32,166 1.960797 .445073 1 3 a_relrd | 32,166 2.136386 1.424996 1 6 -------------+--------------------------------------------------------- a_intsec | 32,166 1.759964 .4319612 1 3 a_roadfc | 32,166 3.926973 1.725527 1 7 a_junc | 32,166 1.835074 .5443225 1 4 a_mancol | 32,166 1.947615 1.337855 1 7 a_tod | 32,166 1.526021 .5146001 1 3 -------------+--------------------------------------------------------- a_dow | 32,166 1.411832 .4957602 1 3 a_ct | 32,166 1.486881 .6206951 1 3 a_lt | 32,166 1.888143 .3151956 1 2 a_mc | 32,166 1.847976 .3590496 1 2 a_spcra | 32,166 1.733943 .4419015 1 2 -------------+--------------------------------------------------------- a_ped | 32,166 1.833737 .3723219 1 2 a_ped_f | 32,166 1.835385 .3708383 1 2 a_pedal | 32,166 1.974569 .1574314 1 2 a_pedal_f | 32,166 1.974725 .156962 1 2 a_roll | 32,166 1.75757 .4285596 1 2 -------------+--------------------------------------------------------- a_polpur | 32,166 1.990642 .0962831 1 2 a_posbac | 32,166 2.308462 .8218877 1 3 a_d15_19 | 32,166 1.903967 .2946412 1 2 a_d16_19 | 32,166 1.906703 .2908531 1 2 a_d15_20 | 32,166 1.870826 .3353973 1 2 -------------+--------------------------------------------------------- a_d16_20 | 32,166 1.873531 .3323823 1 2 a_d65pls | 32,166 1.811975 .3907379 1 2 a_d21_24 | 32,166 1.852235 .3548721 1 2 a_d16_24 | 32,166 1.733507 .4421316 1 2 a_rd | 32,166 1.475253 .499395 1 2 -------------+--------------------------------------------------------- a_hr | 32,166 1.946683 .2246687 1 2 a_dist | 32,166 1.90064 .2991488 1 2 a_drowsy | 32,166 1.977119 .1495274 1 2 by Jean Roth , jroth@nber.org , 22 Oct 2016