Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 548 1995 0 1995 1995 state | 548 43 0 43 43 county | 548 72 0 72 72 fatals | 548 1.085766 .3799571 1 5 st_case | 548 430274.5 158.3382 430001 430548 -------------+--------------------------------------------------------- a_crainj | 548 1 0 1 1 a_region | 548 2 0 2 2 a_ru | 548 1.607664 .488717 1 2 a_inter | 548 1.764599 .4246371 1 2 a_relrd | 548 1.936131 1.34039 1 4 -------------+--------------------------------------------------------- a_intsec | 548 1.921533 .269151 1 2 a_roadfc | 548 3.558394 1.744739 1 6 a_junc | 548 1.921533 .269151 1 2 a_mancol | 548 1.760949 1.213637 1 5 a_rd | 548 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 548 1.693431 .4614902 1 2 a_dow | 548 1.490876 .5003735 1 2 a_hr | 548 1.908759 .2882144 1 2 a_ct | 548 1.388686 .5771547 1 3 a_lt | 548 1.937956 .2414555 1 2 -------------+--------------------------------------------------------- a_mc | 548 1.939781 .2381095 1 2 a_spcra | 548 1.498175 .5004535 1 2 a_ped | 548 1.653285 .476359 1 2 a_pedal | 548 1.978102 .1464836 1 2 a_roll | 548 1.925182 .263337 1 2 -------------+--------------------------------------------------------- a_polpur | 548 1.994526 .0738542 1 2 a_posbac | 548 2.067518 .8252215 1 3 a_d15_19 | 548 1.872263 .334102 1 2 a_d16_19 | 548 1.872263 .334102 1 2 a_d15_20 | 548 1.813869 .3895683 1 2 -------------+--------------------------------------------------------- a_d16_20 | 548 1.813869 .3895683 1 2 a_d65pls | 548 1.945255 .2276887 1 2 a_d21_24 | 548 1.771898 .4199922 1 2 a_d16_24 | 548 1.600365 .4902708 1 2 a_dist | 548 1.99635 .060357 1 2 -------------+--------------------------------------------------------- a_drowsy | 548 1.990876 .0951702 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016