Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 471 2003 0 2003 2003 state | 471 43 0 43 43 county | 471 72 0 72 72 fatals | 471 1.050955 .2386891 1 3 st_case | 471 430236.7 136.5018 430001 430472 -------------+--------------------------------------------------------- a_crainj | 471 1 0 1 1 a_region | 471 2 0 2 2 a_ru | 471 1.524416 .4999345 1 2 a_inter | 471 1.830149 .3759014 1 2 a_relrd | 471 1.912951 1.352249 1 4 -------------+--------------------------------------------------------- a_intsec | 471 1.912951 .2822063 1 2 a_roadfc | 471 3.783439 1.57366 1 6 a_junc | 471 1.912951 .2822063 1 2 a_mancol | 471 1.791932 1.282956 1 5 a_rd | 471 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 471 1.643312 .4795309 1 2 a_dow | 471 1.507431 .5004764 1 2 a_hr | 471 1.919321 .2726317 1 2 a_ct | 471 1.367304 .5676688 1 3 a_lt | 471 1.944798 .2286164 1 2 -------------+--------------------------------------------------------- a_mc | 471 1.881104 .3240102 1 2 a_spcra | 471 1.543524 .4986316 1 2 a_ped | 471 1.683652 .465545 1 2 a_pedal | 471 1.970276 .1700054 1 2 a_roll | 471 1.917197 .2758766 1 2 -------------+--------------------------------------------------------- a_polpur | 471 2 0 2 2 a_posbac | 471 2.014862 .8001276 1 3 a_d15_19 | 471 1.904459 .2942739 1 2 a_d16_19 | 471 1.904459 .2942739 1 2 a_d15_20 | 471 1.866242 .340754 1 2 -------------+--------------------------------------------------------- a_d16_20 | 471 1.866242 .340754 1 2 a_d65pls | 471 1.927813 .2590722 1 2 a_d21_24 | 471 1.791932 .4063573 1 2 a_d16_24 | 471 1.666667 .4719057 1 2 a_dist | 471 1.993631 .0796387 1 2 -------------+--------------------------------------------------------- a_drowsy | 471 1.991507 .0918606 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016