Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 38,648 2006 0 2006 2006 state | 38,648 27.06277 16.28634 1 56 county | 38,648 88.18221 91.96623 0 840 fatals | 38,648 1.105051 .3922917 1 10 st_case | 38,648 271406.6 162704.1 10001 560169 -------------+--------------------------------------------------------- a_crainj | 38,648 1 0 1 1 a_region | 38,648 5.325838 2.388246 1 10 a_ru | 38,648 1.463129 .5117063 1 3 a_inter | 38,648 1.887679 .3561252 1 3 a_relrd | 38,648 2.151573 1.396224 1 6 -------------+--------------------------------------------------------- a_intsec | 38,648 1.786587 .4154919 1 3 a_roadfc | 38,648 3.942765 1.617988 1 7 a_junc | 38,648 1.846745 .5091161 1 4 a_mancol | 38,648 2.001552 1.358824 1 7 a_tod | 38,648 1.528152 .5149302 1 3 -------------+--------------------------------------------------------- a_dow | 38,648 1.42913 .4994339 1 3 a_hr | 38,648 1.956375 .2042608 1 2 a_ct | 38,648 1.478188 .6169816 1 3 a_lt | 38,648 1.887446 .3160513 1 2 a_mc | 38,648 1.877096 .3283314 1 2 -------------+--------------------------------------------------------- a_spcra | 38,648 1.687384 .4635655 1 2 a_ped | 38,648 1.876785 .3286877 1 2 a_pedal | 38,648 1.980025 .1399166 1 2 a_roll | 38,648 1.708161 .4546146 1 2 a_polpur | 38,648 1.991177 .0935179 1 2 -------------+--------------------------------------------------------- a_posbac | 38,648 2.287182 .846295 1 3 a_d15_19 | 38,648 1.855956 .3511386 1 2 a_d16_19 | 38,648 1.860329 .3466497 1 2 a_d15_20 | 38,648 1.814221 .3889335 1 2 a_d16_20 | 38,648 1.818568 .385381 1 2 -------------+--------------------------------------------------------- a_d65pls | 38,648 1.853395 .3537165 1 2 a_d21_24 | 38,648 1.838827 .3676949 1 2 a_d16_24 | 38,648 1.668935 .4706025 1 2 a_rd | 38,648 1.474928 .4993774 1 2 a_dist | 38,648 1.864288 .342487 1 2 -------------+--------------------------------------------------------- a_drowsy | 38,648 1.974255 .1583762 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016