Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 522 1992 0 1992 1992 state | 522 43 0 43 43 county | 522 72 0 72 72 fatals | 522 1.09387 .4119156 1 6 st_case | 522 430266.8 152.1094 430001 430529 -------------+--------------------------------------------------------- a_crainj | 522 1 0 1 1 a_region | 522 2 0 2 2 a_ru | 522 1.496169 .5004649 1 2 a_inter | 522 1.787356 .4095701 1 2 a_relrd | 522 1.890805 1.33517 1 4 -------------+--------------------------------------------------------- a_intsec | 522 1.896552 .3048356 1 2 a_roadfc | 522 4.183908 1.902794 1 6 a_junc | 522 1.896552 .3048356 1 2 a_mancol | 522 1.720307 1.207116 1 5 a_rd | 522 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 522 1.672414 .4738513 1 3 a_dow | 522 1.498084 .5004759 1 2 a_hr | 522 1.898467 .3023223 1 2 a_ct | 522 1.3659 .5764293 1 3 a_lt | 522 1.934866 .246999 1 2 -------------+--------------------------------------------------------- a_mc | 522 1.94636 .2255217 1 2 a_spcra | 522 1.505747 .5004466 1 2 a_ped | 522 1.626437 .4842137 1 2 a_pedal | 522 1.963602 .1874592 1 2 a_roll | 522 1.927203 .2600521 1 2 -------------+--------------------------------------------------------- a_polpur | 522 1.996169 .061839 1 2 a_posbac | 522 2.065134 .8333102 1 3 a_d15_19 | 522 1.869732 .3369211 1 2 a_d16_19 | 522 1.871648 .3348027 1 2 a_d15_20 | 522 1.827586 .378102 1 2 -------------+--------------------------------------------------------- a_d16_20 | 522 1.829502 .3764305 1 2 a_d65pls | 522 1.942529 .2329641 1 2 a_d21_24 | 522 1.787356 .4095701 1 2 a_d16_24 | 522 1.637931 .4810596 1 2 a_dist | 522 2 0 2 2 -------------+--------------------------------------------------------- a_drowsy | 522 1.992337 .0872852 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016