Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 37,435 2007 0 2007 2007 state | 37,435 27.38306 16.24692 1 56 county | 37,435 90.01437 93.68789 0 840 fatals | 37,435 1.10215 .3890284 1 12 st_case | 37,435 274582.4 162343.1 10001 560137 -------------+--------------------------------------------------------- a_crainj | 37,435 1 0 1 1 a_region | 37,435 5.287832 2.367804 1 10 a_ru | 37,435 1.449125 .5023814 1 3 a_inter | 37,435 1.88273 .3423417 1 3 a_relrd | 37,435 2.157446 1.394698 1 6 -------------+--------------------------------------------------------- a_intsec | 37,435 1.780553 .4162588 1 3 a_roadfc | 37,435 3.944223 1.599537 1 7 a_junc | 37,435 1.838654 .5052343 1 4 a_mancol | 37,435 1.983545 1.351685 1 7 a_tod | 37,435 1.531615 .5161115 1 3 -------------+--------------------------------------------------------- a_dow | 37,435 1.430693 .4997978 1 3 a_hr | 37,435 1.955282 .2066857 1 2 a_ct | 37,435 1.472472 .6152151 1 3 a_lt | 37,435 1.887699 .315741 1 2 a_mc | 37,435 1.864111 .3426751 1 2 -------------+--------------------------------------------------------- a_spcra | 37,435 1.686123 .4640734 1 2 a_ped | 37,435 1.875144 .3305605 1 2 a_pedal | 37,435 1.981141 .1360301 1 2 a_roll | 37,435 1.713851 .4519661 1 2 a_polpur | 37,435 1.990063 .0991904 1 2 -------------+--------------------------------------------------------- a_posbac | 37,435 2.235448 .8545558 1 3 a_d15_19 | 37,435 1.860879 .3460775 1 2 a_d16_19 | 37,435 1.864084 .3427035 1 2 a_d15_20 | 37,435 1.820729 .383584 1 2 a_d16_20 | 37,435 1.823881 .3809261 1 2 -------------+--------------------------------------------------------- a_d65pls | 37,435 1.850675 .3564138 1 2 a_d21_24 | 37,435 1.838894 .3676335 1 2 a_d16_24 | 37,435 1.674289 .4686462 1 2 a_rd | 37,435 1.469881 .4990987 1 2 a_dist | 37,435 1.857647 .3494169 1 2 -------------+--------------------------------------------------------- a_drowsy | 37,435 1.975264 .1553222 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016