Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 109,073 2.679838 .9511437 1 5 a_age2 | 109,073 3.580574 1.446284 1 6 a_age3 | 109,073 7.049976 2.586232 1 13 a_age4 | 109,073 3.940389 1.924896 1 8 a_age5 | 109,073 4.184849 2.353647 1 10 -------------+--------------------------------------------------------- a_age6 | 109,073 4.202864 2.332936 1 10 a_age7 | 109,073 6.10372 2.487145 1 12 a_age8 | 109,073 2.878063 1.772414 1 7 veh_no | 109,073 1.274697 .7604676 0 24 per_no | 109,073 1.707205 1.60195 1 41 -------------+--------------------------------------------------------- st_case | 109,073 273215.6 160857.7 10001 560150 year | 109,073 1986 0 1986 1986 a_ptype | 109,073 1.544195 .6954926 1 5 a_rest | 109,073 1.979436 .6042554 1 3 a_alctes | 109,073 2.608437 .9045897 1 5 -------------+--------------------------------------------------------- a_hisp | 109,073 0 0 0 0 a_rcat | 109,073 0 0 0 0 a_hrace | 109,073 0 0 0 0 a_eject | 109,073 1.128501 .3494968 1 3 a_perinj | 109,073 3.887332 2.469824 1 6 -------------+--------------------------------------------------------- a_loc | 109,073 1.148048 .5115231 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016