Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 524 1998 0 1998 1998 state | 524 43 0 43 43 county | 524 72 0 72 72 fatals | 524 1.064885 .3381252 1 5 st_case | 524 430262.5 151.41 430001 430524 -------------+--------------------------------------------------------- a_crainj | 524 1 0 1 1 a_region | 524 2 0 2 2 a_ru | 524 1.608779 .4884901 1 2 a_inter | 524 1.780534 .4142801 1 2 a_relrd | 524 1.858779 1.317299 1 4 -------------+--------------------------------------------------------- a_intsec | 524 1.929389 .2564182 1 2 a_roadfc | 524 3.633588 1.69221 1 6 a_junc | 524 1.929389 .2564182 1 2 a_mancol | 524 1.748092 1.232718 1 5 a_rd | 524 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 524 1.648855 .4817696 1 3 a_dow | 524 1.486641 .5002991 1 2 a_hr | 524 1.925573 .2627161 1 2 a_ct | 524 1.35687 .5570087 1 3 a_lt | 524 1.938931 .2396851 1 2 -------------+--------------------------------------------------------- a_mc | 524 1.946565 .2251144 1 2 a_spcra | 524 1.540076 .4988675 1 2 a_ped | 524 1.64313 .4795338 1 2 a_pedal | 524 1.956107 .2050531 1 2 a_roll | 524 1.912214 .2832542 1 2 -------------+--------------------------------------------------------- a_polpur | 524 2 0 2 2 a_posbac | 524 2.133588 .8070541 1 3 a_d15_19 | 524 1.866412 .340534 1 2 a_d16_19 | 524 1.868321 .338465 1 2 a_d15_20 | 524 1.824427 .3808196 1 2 -------------+--------------------------------------------------------- a_d16_20 | 524 1.826336 .3791824 1 2 a_d65pls | 524 1.935115 .2465591 1 2 a_d21_24 | 524 1.793893 .4048947 1 2 a_d16_24 | 524 1.635496 .4817507 1 2 a_dist | 524 2 0 2 2 -------------+--------------------------------------------------------- a_drowsy | 524 1.996183 .0617211 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016