Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 547 1996 0 1996 1996 state | 547 43 0 43 43 county | 547 72 0 72 72 fatals | 547 1.09872 .36482 1 4 st_case | 547 430278 159.8652 430001 430553 -------------+--------------------------------------------------------- a_crainj | 547 1 0 1 1 a_region | 547 2 0 2 2 a_ru | 547 1.6234 .4849766 1 2 a_inter | 547 1.784278 .4116989 1 2 a_relrd | 547 1.846435 1.315657 1 4 -------------+--------------------------------------------------------- a_intsec | 547 1.93053 .2544841 1 2 a_roadfc | 547 3.645338 1.70927 1 6 a_junc | 547 1.93053 .2544841 1 2 a_mancol | 547 1.79159 1.219681 1 5 a_rd | 547 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 547 1.656307 .4753748 1 2 a_dow | 547 1.497258 .5004501 1 2 a_hr | 547 1.912249 .283192 1 2 a_ct | 547 1.413163 .5783411 1 3 a_lt | 547 1.917733 .2750224 1 2 -------------+--------------------------------------------------------- a_mc | 547 1.952468 .2129686 1 2 a_spcra | 547 1.519196 .5000887 1 2 a_ped | 547 1.641682 .4799452 1 2 a_pedal | 547 1.968921 .173689 1 2 a_roll | 547 1.917733 .2750224 1 2 -------------+--------------------------------------------------------- a_polpur | 547 2 0 2 2 a_posbac | 547 2.062157 .8073457 1 3 a_d15_19 | 547 1.870201 .3363897 1 2 a_d16_19 | 547 1.870201 .3363897 1 2 a_d15_20 | 547 1.808044 .3941993 1 2 -------------+--------------------------------------------------------- a_d16_20 | 547 1.808044 .3941993 1 2 a_d65pls | 547 1.912249 .283192 1 2 a_d21_24 | 547 1.808044 .3941993 1 2 a_d16_24 | 547 1.627057 .4840299 1 2 a_dist | 547 1.998172 .0427569 1 2 -------------+--------------------------------------------------------- a_drowsy | 547 1.989031 .104252 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016