Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 41,090 1986 0 1986 1986 state | 41,090 27.42972 16.06391 1 56 county | 41,090 86.81927 94.47789 0 997 fatals | 41,090 1.121611 .4411732 1 21 st_case | 41,090 275157.5 160438.5 10001 560150 -------------+--------------------------------------------------------- a_crainj | 41,090 1 0 1 1 a_region | 41,090 5.233706 2.476184 1 10 a_ru | 41,090 1.441519 .4976513 1 3 a_inter | 41,090 1.913191 .2943219 1 3 a_relrd | 41,090 2.092139 1.400823 1 6 -------------+--------------------------------------------------------- a_intsec | 41,090 1.796349 .403984 1 3 a_roadfc | 41,090 4.010854 1.483841 1 7 a_junc | 41,090 1.84512 .4800872 1 4 a_mancol | 41,090 1.93816 1.278665 1 7 a_rd | 41,090 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 41,090 1.582477 .5102799 1 3 a_dow | 41,090 1.448893 .5013349 1 3 a_hr | 41,090 1.957654 .2013799 1 2 a_ct | 41,090 1.463908 .5983943 1 3 a_lt | 41,090 1.883548 .3207697 1 2 -------------+--------------------------------------------------------- a_mc | 41,090 1.891458 .3110678 1 2 a_spcra | 41,090 1.641738 .4794956 1 2 a_ped | 41,090 1.836505 .369821 1 2 a_pedal | 41,090 1.977196 .1492787 1 2 a_roll | 41,090 1.760623 .4267084 1 2 -------------+--------------------------------------------------------- a_polpur | 41,090 1.99321 .0821221 1 2 a_posbac | 41,090 2.194354 .9153344 1 3 a_d15_19 | 41,090 1.810294 .3920728 1 2 a_d16_19 | 41,090 1.817157 .3865421 1 2 a_d15_20 | 41,090 1.758919 .4277443 1 2 -------------+--------------------------------------------------------- a_d16_20 | 41,090 1.765612 .4236208 1 2 a_d65pls | 41,090 1.886006 .3178074 1 2 a_d21_24 | 41,090 1.788732 .408213 1 2 a_d16_24 | 41,090 1.573303 .4946036 1 2 a_dist | 41,090 1.891628 .3108533 1 2 -------------+--------------------------------------------------------- a_drowsy | 41,090 1.96824 .1753614 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016