Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 492 2002 0 2002 2002 state | 492 43 0 43 43 county | 492 72 0 72 72 fatals | 492 1.052846 .2497494 1 3 st_case | 492 430247.4 143.0087 430001 430494 -------------+--------------------------------------------------------- a_crainj | 492 1 0 1 1 a_region | 492 2 0 2 2 a_ru | 492 1.506098 .5004717 1 2 a_inter | 492 1.810976 .3919265 1 2 a_relrd | 492 1.949187 1.347646 1 4 -------------+--------------------------------------------------------- a_intsec | 492 1.961382 .1928786 1 2 a_roadfc | 492 3.827236 1.669369 1 6 a_junc | 492 1.961382 .1928786 1 2 a_mancol | 492 1.70935 1.184968 1 6 a_rd | 492 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 492 1.640244 .4804173 1 2 a_dow | 492 1.50813 .5004427 1 2 a_hr | 492 1.906504 .2914225 1 2 a_ct | 492 1.345528 .5401594 1 3 a_lt | 492 1.928862 .2573172 1 2 -------------+--------------------------------------------------------- a_mc | 492 1.876016 .3298984 1 2 a_spcra | 492 1.52439 .4999131 1 2 a_ped | 492 1.644309 .4792094 1 2 a_pedal | 492 1.96748 .177558 1 2 a_roll | 492 1.949187 .2198392 1 2 -------------+--------------------------------------------------------- a_polpur | 492 2 0 2 2 a_posbac | 492 2.081301 .7642042 1 3 a_d15_19 | 492 1.876016 .3298984 1 2 a_d16_19 | 492 1.880081 .3251971 1 2 a_d15_20 | 492 1.817073 .387 1 2 -------------+--------------------------------------------------------- a_d16_20 | 492 1.821138 .3836266 1 2 a_d65pls | 492 1.943089 .2319075 1 2 a_d21_24 | 492 1.784553 .4115506 1 2 a_d16_24 | 492 1.623984 .4848772 1 2 a_dist | 492 2 0 2 2 -------------+--------------------------------------------------------- a_drowsy | 492 1.993902 .0779277 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016