Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 37,526 2000 0 2000 2000 state | 37,526 27.75244 16.13713 1 56 county | 37,526 89.56393 94.13515 0 840 fatals | 37,526 1.117758 .4220639 1 10 st_case | 37,526 278252.6 161296.5 10001 560132 -------------+--------------------------------------------------------- a_crainj | 37,526 1 0 1 1 a_region | 37,526 5.285535 2.350803 1 10 a_ru | 37,526 1.443159 .5430012 1 3 a_inter | 37,526 1.920828 .4184226 1 3 a_relrd | 37,526 2.105713 1.394743 1 6 -------------+--------------------------------------------------------- a_intsec | 37,526 1.775596 .4237232 1 3 a_roadfc | 37,526 4.025209 1.707312 1 7 a_junc | 37,526 1.824122 .5008508 1 4 a_mancol | 37,526 2.013351 1.312902 1 7 a_rd | 37,526 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 37,526 1.513697 .517372 1 3 a_dow | 37,526 1.422267 .49924 1 3 a_hr | 37,526 1.963492 .187553 1 2 a_ct | 37,526 1.506689 .6235405 1 3 a_lt | 37,526 1.878138 .3271309 1 2 -------------+--------------------------------------------------------- a_mc | 37,526 1.923973 .2650453 1 2 a_spcra | 37,526 1.706577 .4553368 1 2 a_ped | 37,526 1.872835 .3331623 1 2 a_pedal | 37,526 1.981559 .1345399 1 2 a_roll | 37,526 1.726003 .4460132 1 2 -------------+--------------------------------------------------------- a_polpur | 37,526 1.992938 .0837382 1 2 a_posbac | 37,526 2.298673 .8426422 1 3 a_d15_19 | 37,526 1.833422 .3726035 1 2 a_d16_19 | 37,526 1.838512 .3679854 1 2 a_d15_20 | 37,526 1.790545 .4069249 1 2 -------------+--------------------------------------------------------- a_d16_20 | 37,526 1.795582 .4032813 1 2 a_d65pls | 37,526 1.841203 .3654911 1 2 a_d21_24 | 37,526 1.847359 .3596457 1 2 a_d16_24 | 37,526 1.655092 .4753445 1 2 a_dist | 37,526 1.893647 .3082929 1 2 -------------+--------------------------------------------------------- a_drowsy | 37,526 1.963812 .1867608 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016