Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 107,777 2.711618 .9458397 1 5 a_age2 | 107,777 3.653154 1.454253 1 6 a_age3 | 107,777 7.134454 2.613694 1 13 a_age4 | 107,777 4.033124 1.930493 1 8 a_age5 | 107,777 4.283409 2.352607 1 10 -------------+--------------------------------------------------------- a_age6 | 107,777 4.298199 2.334996 1 10 a_age7 | 107,777 6.192954 2.504271 1 12 a_age8 | 107,777 2.96246 1.769876 1 7 veh_no | 107,777 1.304425 .9883799 0 38 per_no | 107,777 1.782152 2.180582 1 78 -------------+--------------------------------------------------------- st_case | 107,777 269924 161069.7 10001 560107 year | 107,777 1990 0 1990 1990 a_ptype | 107,777 1.549997 .6965359 1 5 a_rest | 107,777 1.801117 .6261713 1 3 a_alctes | 107,777 2.586544 .9879536 1 5 -------------+--------------------------------------------------------- a_hisp | 107,777 0 0 0 0 a_rcat | 107,777 0 0 0 0 a_hrace | 107,777 0 0 0 0 a_eject | 107,777 1.134287 .3591446 1 3 a_perinj | 107,777 3.930959 2.462586 1 6 -------------+--------------------------------------------------------- a_loc | 107,777 1.142118 .4997233 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016