Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 22 Oct 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 73,711 2.908738 .9178662 1 5 a_age2 | 73,711 3.993854 1.357855 1 6 a_age3 | 73,711 7.75602 2.572768 1 13 a_age4 | 73,711 4.537586 1.885077 1 8 a_age5 | 73,711 4.8747 2.33276 1 10 -------------+--------------------------------------------------------- a_age6 | 73,711 4.882718 2.321118 1 10 a_age7 | 73,711 6.80258 2.472986 1 12 a_age8 | 73,711 3.462726 1.800049 1 7 a_age9 | 73,711 1.938951 .3113482 1 3 st_case | 73,711 277490.8 163858.3 10001 560131 -------------+--------------------------------------------------------- veh_no | 73,711 1.328241 1.014848 0 40 per_no | 73,711 1.641926 1.983992 1 51 year | 73,711 2014 0 2014 2014 a_ptype | 73,711 1.508174 .7359854 1 5 a_rest | 73,711 1.579222 .7610368 1 3 -------------+--------------------------------------------------------- a_alctes | 73,711 2.459674 1.026695 1 5 a_hisp | 73,711 .6115098 .823406 0 3 a_rcat | 73,711 .8514333 1.674325 0 8 a_hrace | 73,711 1.306074 2.124716 0 9 a_eject | 73,711 1.109699 .341197 1 3 -------------+--------------------------------------------------------- a_perinj | 73,711 3.778893 2.484412 1 6 a_loc | 73,711 1.169744 .585032 1 5 by Jean Roth , jroth@nber.org , 22 Oct 2016