Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 537 1986 0 1986 1986 state | 537 43 0 43 43 county | 537 72 0 72 72 fatals | 537 1.102421 .3749797 1 5 st_case | 537 430293.1 171.2137 430001 430587 -------------+--------------------------------------------------------- a_crainj | 537 1 0 1 1 a_region | 537 2 0 2 2 a_ru | 537 1.361266 .4808154 1 2 a_inter | 537 1.992551 .0860645 1 2 a_relrd | 537 1.808194 1.282229 1 4 -------------+--------------------------------------------------------- a_intsec | 537 1.869646 .3370062 1 2 a_roadfc | 537 3.897579 1.168114 1 6 a_junc | 537 1.869646 .3370062 1 2 a_mancol | 537 1.597765 1.006617 1 7 a_rd | 537 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 537 1.668529 .4711809 1 2 a_dow | 537 1.556797 .4972268 1 2 a_hr | 537 1.888268 .31533 1 2 a_ct | 537 1.35568 .5616227 1 3 a_lt | 537 1.977654 .1479452 1 2 -------------+--------------------------------------------------------- a_mc | 537 1.942272 .2334461 1 2 a_spcra | 537 1.499069 .5004653 1 2 a_ped | 537 1.612663 .4875959 1 2 a_pedal | 537 1.972067 .1649344 1 2 a_roll | 537 1.908752 .2882295 1 2 -------------+--------------------------------------------------------- a_polpur | 537 2 0 2 2 a_posbac | 537 2.243948 .9091603 1 3 a_d15_19 | 537 1.899441 .3010239 1 2 a_d16_19 | 537 1.901304 .2985321 1 2 a_d15_20 | 537 1.858473 .3488894 1 2 -------------+--------------------------------------------------------- a_d16_20 | 537 1.860335 .3469621 1 2 a_d65pls | 537 1.945996 .2262358 1 2 a_d21_24 | 537 1.819367 .3850726 1 2 a_d16_24 | 537 1.690875 .4625636 1 2 a_dist | 537 2 0 2 2 -------------+--------------------------------------------------------- a_drowsy | 537 1.994413 .0746039 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016