Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 30,862 2009 0 2009 2009 state | 30,862 27.7529 16.17626 1 56 county | 30,862 90.88086 94.99807 1 999 fatals | 30,862 1.097887 .3836895 1 11 st_case | 30,862 278149.3 161696 10001 560116 -------------+--------------------------------------------------------- a_crainj | 30,862 1 0 1 1 a_region | 30,862 5.282581 2.358346 1 10 a_ru | 30,862 1.441125 .5001061 1 3 a_inter | 30,862 1.889865 .3350616 1 3 a_relrd | 30,862 2.246387 1.437738 1 6 -------------+--------------------------------------------------------- a_intsec | 30,862 1.775906 .4220888 1 3 a_roadfc | 30,862 3.956484 1.598525 1 7 a_junc | 30,862 1.832091 .5104113 1 4 a_mancol | 30,862 1.950554 1.346014 1 7 a_tod | 30,862 1.532143 .5146383 1 3 -------------+--------------------------------------------------------- a_dow | 30,862 1.428326 .4990824 1 3 a_ct | 30,862 1.45023 .6040662 1 3 a_lt | 30,862 1.903344 .2954937 1 2 a_mc | 30,862 1.857851 .3492085 1 2 a_spcra | 30,862 1.690785 .4621775 1 2 -------------+--------------------------------------------------------- a_ped | 30,862 1.867215 .3393473 1 2 a_pedal | 30,862 1.979489 .1417414 1 2 a_roll | 30,862 1.721016 .4485068 1 2 a_polpur | 30,862 1.990344 .0977904 1 2 a_posbac | 30,862 2.181518 .8518672 1 3 -------------+--------------------------------------------------------- a_d15_19 | 30,862 1.877584 .3277709 1 2 a_d16_19 | 30,862 1.880533 .3243428 1 2 a_d15_20 | 30,862 1.83922 .3673341 1 2 a_d16_20 | 30,862 1.842168 .364589 1 2 a_d65pls | 30,862 1.834878 .3712968 1 2 -------------+--------------------------------------------------------- a_d21_24 | 30,862 1.855777 .3513211 1 2 a_d16_24 | 30,862 1.707245 .4550342 1 2 a_rd | 30,862 1.473949 .499329 1 2 a_hr | 30,862 1.960469 .1948573 1 2 a_dist | 30,862 1.840969 .3657105 1 2 -------------+--------------------------------------------------------- a_drowsy | 30,862 1.976314 .1520717 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016