Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 571 1987 0 1987 1987 state | 571 43 0 43 43 county | 571 72 0 72 72 fatals | 571 1.075306 .2954682 1 3 st_case | 571 430294.2 170.7043 430001 430593 -------------+--------------------------------------------------------- a_crainj | 571 1 0 1 1 a_region | 571 2 0 2 2 a_ru | 571 1.446585 .501088 1 3 a_inter | 571 2.001751 .0418487 2 3 a_relrd | 571 1.705779 1.218693 1 6 -------------+--------------------------------------------------------- a_intsec | 571 1.905429 .2988081 1 3 a_roadfc | 571 3.830123 1.204175 2 7 a_junc | 571 1.910683 .314684 1 4 a_mancol | 571 1.562172 .9464086 1 4 a_rd | 571 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 571 1.65324 .4763559 1 2 a_dow | 571 1.509632 .5003455 1 2 a_hr | 571 1.879159 .3262278 1 2 a_ct | 571 1.343257 .5504727 1 3 a_lt | 571 1.982487 .1312883 1 2 -------------+--------------------------------------------------------- a_mc | 571 1.935201 .246386 1 2 a_spcra | 571 1.478109 .4999585 1 2 a_ped | 571 1.58669 .4928593 1 2 a_pedal | 571 1.95972 .196788 1 2 a_roll | 571 1.900175 .3000292 1 2 -------------+--------------------------------------------------------- a_polpur | 571 2 0 2 2 a_posbac | 571 2.229422 .9012133 1 3 a_d15_19 | 571 1.879159 .3262278 1 2 a_d16_19 | 571 1.884413 .320009 1 2 a_d15_20 | 571 1.842382 .3647021 1 2 -------------+--------------------------------------------------------- a_d16_20 | 571 1.847636 .3596887 1 2 a_d65pls | 571 1.961471 .192638 1 2 a_d21_24 | 571 1.816112 .3877324 1 2 a_d16_24 | 571 1.672504 .4697112 1 2 a_dist | 571 1.996497 .0591311 1 2 -------------+--------------------------------------------------------- a_drowsy | 571 1.996497 .0591311 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016