Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 469 2001 0 2001 2001 state | 469 43 0 43 43 county | 469 72 0 72 72 fatals | 469 1.055437 .2382209 1 3 st_case | 469 430235.5 135.9647 430001 430470 -------------+--------------------------------------------------------- a_crainj | 469 1 0 1 1 a_region | 469 2 0 2 2 a_ru | 469 1.605544 .4892555 1 2 a_inter | 469 1.810235 .3925342 1 2 a_relrd | 469 1.993603 1.365776 1 4 -------------+--------------------------------------------------------- a_intsec | 469 1.953092 .2116683 1 2 a_roadfc | 469 3.780384 1.669472 1 6 a_junc | 469 1.953092 .2116683 1 2 a_mancol | 469 1.701493 1.207357 1 5 a_rd | 469 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 469 1.673774 .4693317 1 2 a_dow | 469 1.507463 .5004781 1 2 a_hr | 469 1.923241 .266493 1 2 a_ct | 469 1.347548 .5515125 1 3 a_lt | 469 1.938166 .2411104 1 2 -------------+--------------------------------------------------------- a_mc | 469 1.897655 .3034257 1 2 a_spcra | 469 1.528785 .4997038 1 2 a_ped | 469 1.637527 .4812278 1 2 a_pedal | 469 1.963753 .1871045 1 2 a_roll | 469 1.929638 .25603 1 2 -------------+--------------------------------------------------------- a_polpur | 469 2 0 2 2 a_posbac | 469 2.115139 .8030158 1 3 a_d15_19 | 469 1.901919 .2977418 1 2 a_d16_19 | 469 1.901919 .2977418 1 2 a_d15_20 | 469 1.840085 .3669183 1 2 -------------+--------------------------------------------------------- a_d16_20 | 469 1.840085 .3669183 1 2 a_d65pls | 469 1.927505 .2595821 1 2 a_d21_24 | 469 1.793177 .40546 1 2 a_d16_24 | 469 1.665245 .4724086 1 2 a_dist | 469 2 0 2 2 -------------+--------------------------------------------------------- a_drowsy | 469 1.993603 .0798076 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016