Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 343 2009 0 2009 2009 state | 343 43 0 43 43 county | 343 72 0 72 72 fatals | 343 1.06414 .2891251 1 4 st_case | 343 430174.8 100.1584 430001 430347 -------------+--------------------------------------------------------- a_crainj | 343 1 0 1 1 a_region | 343 2 0 2 2 a_ru | 343 1.457726 .4989375 1 2 a_inter | 343 1.836735 .3701475 1 2 a_relrd | 343 1.991254 1.377528 1 4 -------------+--------------------------------------------------------- a_intsec | 343 1.883382 .3214335 1 2 a_roadfc | 343 3.80758 1.639516 1 6 a_junc | 343 1.883382 .3214335 1 2 a_mancol | 343 1.766764 1.294773 1 6 a_tod | 343 1.644315 .4854805 1 3 -------------+--------------------------------------------------------- a_dow | 343 1.51895 .5003707 1 2 a_ct | 343 1.355685 .583913 1 3 a_lt | 343 1.944606 .2290811 1 2 a_mc | 343 1.83965 .3674663 1 2 a_spcra | 343 1.594752 .4916572 1 2 -------------+--------------------------------------------------------- a_ped | 343 1.682216 .4662953 1 2 a_pedal | 343 1.953353 .2111902 1 2 a_roll | 343 1.950437 .2173568 1 2 a_polpur | 343 2 0 2 2 a_posbac | 343 2.052478 .7629111 1 3 -------------+--------------------------------------------------------- a_d15_19 | 343 1.895044 .3069448 1 2 a_d16_19 | 343 1.895044 .3069448 1 2 a_d15_20 | 343 1.860058 .3474334 1 2 a_d16_20 | 343 1.860058 .3474334 1 2 a_d65pls | 343 1.897959 .3031442 1 2 -------------+--------------------------------------------------------- a_d21_24 | 343 1.798834 .4014576 1 2 a_d16_24 | 343 1.676385 .4685386 1 2 a_rd | 343 1.728863 .4451961 1 2 a_hr | 343 1.900875 .2992668 1 2 a_dist | 343 1.997085 .0539949 1 2 -------------+--------------------------------------------------------- a_drowsy | 343 1.991254 .0932481 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016