Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 484 2006 0 2006 2006 state | 484 43 0 43 43 county | 484 72 0 72 72 fatals | 484 1.051653 .2562215 1 3 st_case | 484 430244.9 140.715 430001 430487 -------------+--------------------------------------------------------- a_crainj | 484 1 0 1 1 a_region | 484 2 0 2 2 a_ru | 484 1.504132 .5005002 1 2 a_inter | 484 1.830579 .3755119 1 2 a_relrd | 484 2.014463 1.373288 1 4 -------------+--------------------------------------------------------- a_intsec | 484 1.981405 .1352296 1 2 a_roadfc | 484 3.694215 1.598876 1 6 a_junc | 484 1.981405 .1352296 1 2 a_mancol | 484 1.832645 1.307285 1 5 a_tod | 484 1.626033 .4843556 1 2 -------------+--------------------------------------------------------- a_dow | 484 1.469008 .4995549 1 2 a_hr | 484 1.921488 .2692545 1 2 a_ct | 484 1.353306 .539505 1 3 a_lt | 484 1.938017 .241375 1 2 a_mc | 484 1.768595 .422167 1 2 -------------+--------------------------------------------------------- a_spcra | 484 1.57438 .4949482 1 2 a_ped | 484 1.719008 .4499485 1 2 a_pedal | 484 1.958678 .1992406 1 2 a_roll | 484 1.915289 .2787389 1 2 a_polpur | 484 2 0 2 2 -------------+--------------------------------------------------------- a_posbac | 484 2.033058 .7244203 1 3 a_d15_19 | 484 1.878099 .3275097 1 2 a_d16_19 | 484 1.884298 .3201988 1 2 a_d15_20 | 484 1.830579 .3755119 1 2 a_d16_20 | 484 1.836777 .3699515 1 2 -------------+--------------------------------------------------------- a_d65pls | 484 1.911157 .2848113 1 2 a_d21_24 | 484 1.832645 .3736791 1 2 a_d16_24 | 484 1.681818 .4662524 1 2 a_rd | 484 1.725207 .446872 1 2 a_dist | 484 2 0 2 2 -------------+--------------------------------------------------------- a_drowsy | 484 1.989669 .1012177 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016