Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 384 2008 0 2008 2008 state | 384 43 0 43 43 county | 384 72 0 72 72 fatals | 384 1.054688 .2495508 1 3 st_case | 384 430193.5 111.0045 430001 430385 -------------+--------------------------------------------------------- a_crainj | 384 1 0 1 1 a_region | 384 2 0 2 2 a_ru | 384 1.479167 .5002175 1 2 a_inter | 384 1.809896 .3928951 1 2 a_relrd | 384 1.848958 1.305981 1 4 -------------+--------------------------------------------------------- a_intsec | 384 1.994792 .0720745 1 2 a_roadfc | 384 3.630208 1.605709 1 6 a_junc | 384 1.994792 .0720745 1 2 a_mancol | 384 1.804688 1.266511 1 6 a_tod | 384 1.658854 .4747128 1 2 -------------+--------------------------------------------------------- a_dow | 384 1.523438 .500102 1 2 a_hr | 384 1.921875 .2687183 1 2 a_ct | 384 1.393229 .5906636 1 3 a_lt | 384 1.927083 .2603389 1 2 a_mc | 384 1.789063 .4085064 1 2 -------------+--------------------------------------------------------- a_spcra | 384 1.606771 .4891042 1 2 a_ped | 384 1.666667 .4720195 1 2 a_pedal | 384 1.966146 .1810897 1 2 a_roll | 384 1.932292 .2515725 1 2 a_polpur | 384 2 0 2 2 -------------+--------------------------------------------------------- a_posbac | 384 1.942708 .7382493 1 3 a_d15_19 | 384 1.893229 .3092246 1 2 a_d16_19 | 384 1.895833 .3058752 1 2 a_d15_20 | 384 1.864583 .3426145 1 2 a_d16_20 | 384 1.867188 .3398147 1 2 -------------+--------------------------------------------------------- a_d65pls | 384 1.882813 .3220632 1 2 a_d21_24 | 384 1.848958 .3585567 1 2 a_d16_24 | 384 1.723958 .4476209 1 2 a_rd | 384 1.755208 .4305246 1 2 a_dist | 384 2 0 2 2 -------------+--------------------------------------------------------- a_drowsy | 384 1.992188 .0881573 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016