Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 94,338 2.797431 .9201732 1 5 a_age2 | 94,338 3.841888 1.424771 1 6 a_age3 | 94,338 7.464638 2.568234 1 13 a_age4 | 94,338 4.305073 1.918526 1 8 a_age5 | 94,338 4.586625 2.336176 1 10 -------------+--------------------------------------------------------- a_age6 | 94,338 4.598539 2.32035 1 10 a_age7 | 94,338 6.513388 2.469783 1 12 a_age8 | 94,338 3.219625 1.782444 1 7 veh_no | 94,338 1.484863 2.801114 0 92 per_no | 94,338 1.705697 2.039075 1 66 -------------+--------------------------------------------------------- st_case | 94,338 269443.1 162965 10001 560137 year | 94,338 2007 0 2007 2007 a_ptype | 94,338 1.488594 .6760038 1 5 a_rest | 94,338 1.528663 .6458413 1 3 a_alctes | 94,338 2.518254 .9960492 1 5 -------------+--------------------------------------------------------- a_hisp | 94,338 .6017193 .8274907 0 3 a_rcat | 94,338 .9177426 1.854468 0 8 a_hrace | 94,338 1.330376 2.208995 0 9 a_eject | 94,338 1.126216 .3466503 1 3 a_perinj | 94,338 3.813235 2.480312 1 6 -------------+--------------------------------------------------------- a_loc | 94,338 1.110592 .4414618 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016