Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 37,140 1999 0 1999 1999 state | 37,140 27.83691 16.03404 1 56 county | 37,140 88.91408 92.17379 0 999 fatals | 37,140 1.123236 .450009 1 22 st_case | 37,140 279069 160271.9 10001 560162 -------------+--------------------------------------------------------- a_crainj | 37,140 1 0 1 1 a_region | 37,140 5.262143 2.337165 1 10 a_ru | 37,140 1.402585 .4962107 1 3 a_inter | 37,140 1.886241 .3581687 1 3 a_relrd | 37,140 2.093807 1.391964 1 6 -------------+--------------------------------------------------------- a_intsec | 37,140 1.77259 .4260461 1 3 a_roadfc | 37,140 3.940468 1.618851 1 7 a_junc | 37,140 1.824852 .5085145 1 4 a_mancol | 37,140 2.020759 1.320938 1 7 a_rd | 37,140 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 37,140 1.506543 .5165979 1 3 a_dow | 37,140 1.418282 .4973607 1 3 a_hr | 37,140 1.962978 .1888184 1 2 a_ct | 37,140 1.504793 .6209962 1 3 a_lt | 37,140 1.877221 .3281874 1 2 -------------+--------------------------------------------------------- a_mc | 37,140 1.934033 .2482271 1 2 a_spcra | 37,140 1.703069 .4569118 1 2 a_ped | 37,140 1.867313 .3392408 1 2 a_pedal | 37,140 1.979672 .1411233 1 2 a_roll | 37,140 1.717798 .4500774 1 2 -------------+--------------------------------------------------------- a_polpur | 37,140 1.992676 .0852655 1 2 a_posbac | 37,140 2.306677 .8401228 1 3 a_d15_19 | 37,140 1.829995 .3756426 1 2 a_d16_19 | 37,140 1.835245 .3709643 1 2 a_d15_20 | 37,140 1.789634 .4075742 1 2 -------------+--------------------------------------------------------- a_d16_20 | 37,140 1.79483 .403831 1 2 a_d65pls | 37,140 1.83196 .3739067 1 2 a_d21_24 | 37,140 1.853796 .3533149 1 2 a_d16_24 | 37,140 1.660905 .4734086 1 2 a_dist | 37,140 1.893807 .3080884 1 2 -------------+--------------------------------------------------------- a_drowsy | 37,140 1.963274 .1880906 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016