Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 545 1994 0 1994 1994 state | 545 43 0 43 43 county | 545 72 0 72 72 fatals | 545 1.097248 .4063962 1 5 st_case | 545 430276.3 159.1186 430001 430550 -------------+--------------------------------------------------------- a_crainj | 545 1 0 1 1 a_region | 545 2 0 2 2 a_ru | 545 1.622018 .4853285 1 2 a_inter | 545 1.777982 .4159852 1 2 a_relrd | 545 1.913761 1.359165 1 4 -------------+--------------------------------------------------------- a_intsec | 545 1.948624 .2209666 1 2 a_roadfc | 545 3.508257 1.714028 1 6 a_junc | 545 1.948624 .2209666 1 2 a_mancol | 545 1.743119 1.189752 1 5 a_rd | 545 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 545 1.623853 .4848626 1 2 a_dow | 545 1.462385 .4990412 1 2 a_hr | 545 1.911927 .283662 1 2 a_ct | 545 1.405505 .6262979 1 3 a_lt | 545 1.92844 .2579942 1 2 -------------+--------------------------------------------------------- a_mc | 545 1.937615 .2420763 1 2 a_spcra | 545 1.53211 .4994263 1 2 a_ped | 545 1.629358 .4834205 1 2 a_pedal | 545 1.966972 .1788726 1 2 a_roll | 545 1.933945 .2486065 1 2 -------------+--------------------------------------------------------- a_polpur | 545 2 0 2 2 a_posbac | 545 2.104587 .8010087 1 3 a_d15_19 | 545 1.86789 .3389215 1 2 a_d16_19 | 545 1.86789 .3389215 1 2 a_d15_20 | 545 1.822018 .3828487 1 2 -------------+--------------------------------------------------------- a_d16_20 | 545 1.822018 .3828487 1 2 a_d65pls | 545 1.926606 .2610225 1 2 a_d21_24 | 545 1.794495 .4044411 1 2 a_d16_24 | 545 1.627523 .4839086 1 2 a_dist | 545 1.998165 .0428353 1 2 -------------+--------------------------------------------------------- a_drowsy | 545 1.992661 .085434 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016