Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 37,976 1983 0 1983 1983 state | 37,976 27.77823 16.02197 1 56 county | 37,976 87.63648 95.1073 1 997 fatals | 37,976 1.121471 .432658 1 11 st_case | 37,976 278565.8 160092.5 10001 560152 -------------+--------------------------------------------------------- a_crainj | 37,976 1 0 1 1 a_region | 37,976 5.272304 2.466861 1 10 a_ru | 37,976 1.44299 .5001797 1 3 a_inter | 37,976 1.910865 .2986596 1 3 a_relrd | 37,976 2.066252 1.387989 1 6 -------------+--------------------------------------------------------- a_intsec | 37,976 1.795818 .4037603 1 3 a_roadfc | 37,976 3.998894 1.491357 1 7 a_junc | 37,976 1.857594 .4967271 1 4 a_mancol | 37,976 1.890694 1.254241 1 7 a_rd | 37,976 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 37,976 1.599774 .5027366 1 3 a_dow | 37,976 1.453155 .5011287 1 3 a_hr | 37,976 1.958395 .199688 1 2 a_ct | 37,976 1.437539 .5787968 1 3 a_lt | 37,976 1.878476 .3267397 1 2 -------------+--------------------------------------------------------- a_mc | 37,976 1.88943 .3136028 1 2 a_spcra | 37,976 1.670055 .4701991 1 2 a_ped | 37,976 1.822151 .3823908 1 2 a_pedal | 37,976 1.977775 .1474151 1 2 a_roll | 37,976 1.769618 .4210831 1 2 -------------+--------------------------------------------------------- a_polpur | 37,976 1.993575 .0798999 1 2 a_posbac | 37,976 2.344665 .8929787 1 3 a_d15_19 | 37,976 1.817411 .3863343 1 2 a_d16_19 | 37,976 1.822493 .3821021 1 2 a_d15_20 | 37,976 1.762324 .4256655 1 2 -------------+--------------------------------------------------------- a_d16_20 | 37,976 1.767379 .4225079 1 2 a_d65pls | 37,976 1.897725 .3030138 1 2 a_d21_24 | 37,976 1.788761 .4081927 1 2 a_d16_24 | 37,976 1.576127 .4941772 1 2 a_dist | 37,976 1.903676 .2950389 1 2 -------------+--------------------------------------------------------- a_drowsy | 37,976 1.968875 .1736576 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016