Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 521 2000 0 2000 2000 state | 521 43 0 43 43 county | 521 72 0 72 72 fatals | 521 1.090211 .3361549 1 4 st_case | 521 430261 150.544 430001 430521 -------------+--------------------------------------------------------- a_crainj | 521 1 0 1 1 a_region | 521 2 0 2 2 a_ru | 521 1.585413 .4931241 1 2 a_inter | 521 1.796545 .4029549 1 2 a_relrd | 521 1.84453 1.315884 1 4 -------------+--------------------------------------------------------- a_intsec | 521 1.928983 .2571006 1 2 a_roadfc | 521 3.710173 1.656709 1 6 a_junc | 521 1.928983 .2571006 1 2 a_mancol | 521 1.817658 1.233879 1 5 a_rd | 521 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 521 1.635317 .4818038 1 2 a_dow | 521 1.49904 .5004796 1 2 a_hr | 521 1.927063 .2602824 1 2 a_ct | 521 1.393474 .5723397 1 3 a_lt | 521 1.909789 .2867593 1 2 -------------+--------------------------------------------------------- a_mc | 521 1.90595 .2921787 1 2 a_spcra | 521 1.522073 .4999926 1 2 a_ped | 521 1.650672 .477216 1 2 a_pedal | 521 1.978887 .1439 1 2 a_roll | 521 1.927063 .2602824 1 2 -------------+--------------------------------------------------------- a_polpur | 521 1.996161 .0618982 1 2 a_posbac | 521 2.082534 .7788688 1 3 a_d15_19 | 521 1.861804 .345437 1 2 a_d16_19 | 521 1.863724 .3434116 1 2 a_d15_20 | 521 1.794626 .4043631 1 2 -------------+--------------------------------------------------------- a_d16_20 | 521 1.796545 .4029549 1 2 a_d65pls | 521 1.928983 .2571006 1 2 a_d21_24 | 521 1.78119 .4138368 1 2 a_d16_24 | 521 1.596929 .4909862 1 2 a_dist | 521 2 0 2 2 -------------+--------------------------------------------------------- a_drowsy | 521 1.988484 .1067969 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016