Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 447 1990 0 1990 1990 state | 447 43 0 43 43 county | 447 72 0 72 72 fatals | 447 1.058166 .3364537 1 6 st_case | 447 430226.7 131.3798 430001 430453 -------------+--------------------------------------------------------- a_crainj | 447 1 0 1 1 a_region | 447 2 0 2 2 a_ru | 447 1.494407 .5005289 1 2 a_inter | 447 1.769575 .4215767 1 2 a_relrd | 447 1.883669 1.327487 1 4 -------------+--------------------------------------------------------- a_intsec | 447 1.919463 .2724275 1 2 a_roadfc | 447 4.091723 1.978154 1 6 a_junc | 447 1.919463 .2724275 1 2 a_mancol | 447 1.675615 1.171374 1 6 a_rd | 447 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 447 1.673378 .4695031 1 2 a_dow | 447 1.512304 .5004086 1 2 a_hr | 447 1.879195 .3262661 1 2 a_ct | 447 1.355705 .5611546 1 3 a_lt | 447 2 0 2 2 -------------+--------------------------------------------------------- a_mc | 447 1.923937 .2653953 1 2 a_spcra | 447 1.516779 .5002783 1 2 a_ped | 447 1.608501 .4886324 1 2 a_pedal | 447 1.955257 .2069702 1 2 a_roll | 447 1.93736 .2425855 1 2 -------------+--------------------------------------------------------- a_polpur | 447 2 0 2 2 a_posbac | 447 2.228188 .8559012 1 3 a_d15_19 | 447 1.865772 .3412793 1 2 a_d16_19 | 447 1.870246 .336409 1 2 a_d15_20 | 447 1.823266 .3818706 1 2 -------------+--------------------------------------------------------- a_d16_20 | 447 1.82774 .3780289 1 2 a_d65pls | 447 1.941834 .2343185 1 2 a_d21_24 | 447 1.803132 .3980773 1 2 a_d16_24 | 447 1.646532 .4785819 1 2 a_dist | 447 1.997763 .0472984 1 2 -------------+--------------------------------------------------------- a_drowsy | 447 2 0 2 2 by Jean Roth , jroth@nber.org , 18 Apr 2016