Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 553 1993 0 1993 1993 state | 553 43 0 43 43 county | 553 72 0 72 72 fatals | 553 1.084991 .3378465 1 4 st_case | 553 430280.4 162.5713 430001 430567 -------------+--------------------------------------------------------- a_crainj | 553 1 0 1 1 a_region | 553 2 0 2 2 a_ru | 553 1.55877 .4969836 1 2 a_inter | 553 1.75226 .4320906 1 2 a_relrd | 553 1.857143 1.332233 1 4 -------------+--------------------------------------------------------- a_intsec | 553 1.915009 .2791207 1 2 a_roadfc | 553 4.075949 1.995834 1 6 a_junc | 553 1.915009 .2791207 1 2 a_mancol | 553 1.745027 1.250398 1 5 a_rd | 553 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 553 1.632911 .4861879 1 3 a_dow | 553 1.495479 .5004322 1 2 a_hr | 553 1.875226 .3307616 1 2 a_ct | 553 1.367089 .5718027 1 3 a_lt | 553 1.947559 .2231169 1 2 -------------+--------------------------------------------------------- a_mc | 553 1.94575 .2267145 1 2 a_spcra | 553 1.531646 .4994493 1 2 a_ped | 553 1.593128 .4916953 1 2 a_pedal | 553 1.965642 .182312 1 2 a_roll | 553 1.936709 .2437063 1 2 -------------+--------------------------------------------------------- a_polpur | 553 2 0 2 2 a_posbac | 553 2.101266 .8300615 1 3 a_d15_19 | 553 1.864376 .3426987 1 2 a_d16_19 | 553 1.869801 .3368268 1 2 a_d15_20 | 553 1.820976 .3837191 1 2 -------------+--------------------------------------------------------- a_d16_20 | 553 1.826401 .3791068 1 2 a_d65pls | 553 1.933092 .2500884 1 2 a_d21_24 | 553 1.808318 .3939804 1 2 a_d16_24 | 553 1.650995 .4770872 1 2 a_dist | 553 1.998192 .0425243 1 2 -------------+--------------------------------------------------------- a_drowsy | 553 1.990958 .0947421 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016