Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 465 2004 0 2004 2004 state | 465 43 0 43 43 county | 465 72 0 72 72 fatals | 465 1.064516 .3081666 1 4 st_case | 465 430236 135.6789 430001 430470 -------------+--------------------------------------------------------- a_crainj | 465 1 0 1 1 a_region | 465 2 0 2 2 a_ru | 465 1.541935 .4987749 1 2 a_inter | 465 1.830108 .3759428 1 2 a_relrd | 465 1.984946 1.36686 1 4 -------------+--------------------------------------------------------- a_intsec | 465 1.980645 .1379171 1 2 a_roadfc | 465 3.815054 1.602863 1 6 a_junc | 465 1.980645 .1379171 1 2 a_mancol | 465 1.765591 1.315892 1 5 a_tod | 465 1.668817 .4711455 1 2 -------------+--------------------------------------------------------- a_dow | 465 1.552688 .4977517 1 2 a_hr | 465 1.877419 .3283084 1 2 a_ct | 465 1.339785 .5420149 1 3 a_lt | 465 1.948387 .2214825 1 2 a_mc | 465 1.860215 .3471372 1 2 -------------+--------------------------------------------------------- a_spcra | 465 1.531183 .4995641 1 2 a_ped | 465 1.651613 .4769725 1 2 a_pedal | 465 1.963441 .1878789 1 2 a_roll | 465 1.931183 .2534157 1 2 a_polpur | 465 2 0 2 2 -------------+--------------------------------------------------------- a_posbac | 465 2.111828 .8070072 1 3 a_d15_19 | 465 1.868817 .3379638 1 2 a_d16_19 | 465 1.870968 .3355967 1 2 a_d15_20 | 465 1.808602 .3938252 1 2 a_d16_20 | 465 1.810753 .3921268 1 2 -------------+--------------------------------------------------------- a_d65pls | 465 1.931183 .2534157 1 2 a_d21_24 | 465 1.8 .4004308 1 2 a_d16_24 | 465 1.623656 .4849897 1 2 a_rd | 465 1.739785 .4392244 1 2 a_dist | 465 2 0 2 2 -------------+--------------------------------------------------------- a_drowsy | 465 1.997849 .0463739 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016