Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 42,130 1988 0 1988 1988 state | 42,130 27.21619 15.9911 1 56 county | 42,130 85.16295 91.07425 0 997 fatals | 42,130 1.11766 .4341234 1 27 st_case | 42,130 273050.8 159672.5 10001 560131 -------------+--------------------------------------------------------- a_crainj | 42,130 1 0 1 1 a_region | 42,130 5.226703 2.48017 1 10 a_ru | 42,130 1.424757 .4961333 1 3 a_inter | 42,130 1.903845 .3265157 1 3 a_relrd | 42,130 2.093496 1.400304 1 6 -------------+--------------------------------------------------------- a_intsec | 42,130 1.789343 .409233 1 3 a_roadfc | 42,130 3.985474 1.53523 1 7 a_junc | 42,130 1.838049 .4852988 1 4 a_mancol | 42,130 1.948967 1.289424 1 7 a_rd | 42,130 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 42,130 1.567173 .5113166 1 3 a_dow | 42,130 1.447045 .5015667 1 3 a_hr | 42,130 1.958011 .2005666 1 2 a_ct | 42,130 1.470662 .6031526 1 3 a_lt | 42,130 1.884049 .3201695 1 2 -------------+--------------------------------------------------------- a_mc | 42,130 1.913553 .2810259 1 2 a_spcra | 42,130 1.657014 .4747125 1 2 a_ped | 42,130 1.83812 .368345 1 2 a_pedal | 42,130 1.978258 .1458424 1 2 a_roll | 42,130 1.749561 .4332711 1 2 -------------+--------------------------------------------------------- a_polpur | 42,130 1.99371 .079061 1 2 a_posbac | 42,130 2.207097 .9027333 1 3 a_d15_19 | 42,130 1.815025 .388282 1 2 a_d16_19 | 42,130 1.820366 .3838873 1 2 a_d15_20 | 42,130 1.766319 .4231769 1 2 -------------+--------------------------------------------------------- a_d16_20 | 42,130 1.771588 .4198145 1 2 a_d65pls | 42,130 1.877878 .3274305 1 2 a_d21_24 | 42,130 1.806456 .3950801 1 2 a_d16_24 | 42,130 1.594897 .4909178 1 2 a_dist | 42,130 1.89295 .30918 1 2 -------------+--------------------------------------------------------- a_drowsy | 42,130 1.965013 .1837489 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016