Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 22 Oct 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 31,006 2012 0 2012 2012 state | 31,006 28.04941 16.2114 1 56 st_case | 31,006 281124.7 162086 10001 560113 county | 31,006 91.42708 95.13746 0 999 fatals | 31,006 1.089531 .3703867 1 15 -------------+--------------------------------------------------------- a_crainj | 31,006 1 0 1 1 a_region | 31,006 5.245694 2.344292 1 10 a_ru | 31,006 1.465491 .5015883 1 3 a_inter | 31,006 1.894666 .3337674 1 3 a_relrd | 31,006 2.225505 1.439611 1 6 -------------+--------------------------------------------------------- a_intsec | 31,006 1.768787 .4251955 1 3 a_roadfc | 31,006 3.957331 1.579486 1 7 a_junc | 31,006 1.847449 .5409958 1 4 a_mancol | 31,006 1.902632 1.326774 1 7 a_tod | 31,006 1.525318 .5146969 1 3 -------------+--------------------------------------------------------- a_dow | 31,006 1.421564 .4979799 1 3 a_ct | 31,006 1.456299 .6123042 1 3 a_lt | 31,006 1.88757 .3158997 1 2 a_mc | 31,006 1.842127 .3646275 1 2 a_spcra | 31,006 1.700897 .4578726 1 2 -------------+--------------------------------------------------------- a_ped | 31,006 1.845933 .3610187 1 2 a_pedal | 31,006 1.976134 .1526352 1 2 a_roll | 31,006 1.738083 .4396848 1 2 a_polpur | 31,006 1.990486 .0970776 1 2 a_posbac | 31,006 2.213249 .838864 1 3 -------------+--------------------------------------------------------- a_d15_19 | 31,006 1.900697 .2990737 1 2 a_d16_19 | 31,006 1.902922 .2960687 1 2 a_d15_20 | 31,006 1.86522 .3414943 1 2 a_d16_20 | 31,006 1.867413 .3391336 1 2 a_d65pls | 31,006 1.82455 .3803576 1 2 -------------+--------------------------------------------------------- a_d21_24 | 31,006 1.851609 .3554925 1 2 a_d16_24 | 31,006 1.727279 .445366 1 2 a_rd | 31,006 1.445881 .4970706 1 2 a_hr | 31,006 1.952622 .2124493 1 2 a_dist | 31,006 1.900084 .299893 1 2 -------------+--------------------------------------------------------- a_drowsy | 31,006 1.976005 .153037 1 2 by Jean Roth , jroth@nber.org , 22 Oct 2016