Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 34,942 1992 0 1992 1992 state | 34,942 27.41497 16.05135 1 56 county | 34,942 87.22074 92.96857 0 997 fatals | 34,942 1.12329 .4290764 1 8 st_case | 34,942 274854.8 160371.9 10001 560099 -------------+--------------------------------------------------------- a_crainj | 34,942 1 0 1 1 a_region | 34,942 5.276544 2.428914 1 10 a_ru | 34,942 1.439099 .5067841 1 3 a_inter | 34,942 1.904671 .3318328 1 3 a_relrd | 34,942 2.114647 1.417516 1 6 -------------+--------------------------------------------------------- a_intsec | 34,942 1.778519 .4169005 1 3 a_roadfc | 34,942 3.981083 1.558863 1 7 a_junc | 34,942 1.832895 .500687 1 4 a_mancol | 34,942 1.960048 1.288367 1 7 a_rd | 34,942 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 34,942 1.550627 .5131828 1 3 a_dow | 34,942 1.436123 .499819 1 3 a_hr | 34,942 1.959619 .1968544 1 2 a_ct | 34,942 1.474787 .6049056 1 3 a_lt | 34,942 1.890533 .3122289 1 2 -------------+--------------------------------------------------------- a_mc | 34,942 1.932173 .2514519 1 2 a_spcra | 34,942 1.683933 .4649459 1 2 a_ped | 34,942 1.842224 .3645358 1 2 a_pedal | 34,942 1.979337 .1422548 1 2 a_roll | 34,942 1.745464 .4356064 1 2 -------------+--------------------------------------------------------- a_polpur | 34,942 1.992817 .0844508 1 2 a_posbac | 34,942 2.227033 .8845355 1 3 a_d15_19 | 34,942 1.840851 .3658206 1 2 a_d16_19 | 34,942 1.846546 .36043 1 2 a_d15_20 | 34,942 1.798352 .4012368 1 2 -------------+--------------------------------------------------------- a_d16_20 | 34,942 1.803961 .3970042 1 2 a_d65pls | 34,942 1.850982 .3561117 1 2 a_d21_24 | 34,942 1.827171 .378105 1 2 a_d16_24 | 34,942 1.64381 .4788792 1 2 a_dist | 34,942 1.898689 .3017441 1 2 -------------+--------------------------------------------------------- a_drowsy | 34,942 1.963912 .1865127 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016