Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 552 1997 0 1997 1997 state | 552 43 0 43 43 county | 552 71.86957 3.064524 0 72 fatals | 552 1.072464 .2923757 1 3 st_case | 552 430277.1 159.8902 430001 430553 -------------+--------------------------------------------------------- a_crainj | 552 1 0 1 1 a_region | 552 2 0 2 2 a_ru | 552 1.628623 .4836112 1 2 a_inter | 552 1.775362 .417722 1 2 a_relrd | 552 1.931159 1.354822 1 4 -------------+--------------------------------------------------------- a_intsec | 552 1.911232 .2846667 1 2 a_roadfc | 552 3.532609 1.723865 1 6 a_junc | 552 1.911232 .2846667 1 2 a_mancol | 552 1.653986 1.142252 1 5 a_rd | 552 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 552 1.63587 .4816219 1 2 a_dow | 552 1.483696 .5001874 1 2 a_hr | 552 1.914855 .2793504 1 2 a_ct | 552 1.336957 .5444424 1 3 a_lt | 552 1.943841 .2304381 1 2 -------------+--------------------------------------------------------- a_mc | 552 1.951087 .2158819 1 2 a_spcra | 552 1.514493 .5002432 1 2 a_ped | 552 1.619565 .4859341 1 2 a_pedal | 552 1.958333 .2000076 1 2 a_roll | 552 1.913043 .2820269 1 2 -------------+--------------------------------------------------------- a_polpur | 552 1.998188 .0425628 1 2 a_posbac | 552 2.11413 .7806761 1 3 a_d15_19 | 552 1.860507 .3467742 1 2 a_d16_19 | 552 1.862319 .3448776 1 2 a_d15_20 | 552 1.793478 .4051764 1 2 -------------+--------------------------------------------------------- a_d16_20 | 552 1.79529 .4038556 1 2 a_d65pls | 552 1.923913 .2653777 1 2 a_d21_24 | 552 1.791667 .4064848 1 2 a_d16_24 | 552 1.605072 .4892785 1 2 a_dist | 552 2 0 2 2 -------------+--------------------------------------------------------- a_drowsy | 552 1.996377 .0601383 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016