Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,174 2.806644 1.016114 1 5 a_age2 | 1,174 3.787053 1.480986 1 6 a_age3 | 1,174 7.421635 2.741536 1 13 a_age4 | 1,174 4.245315 2.026119 1 8 a_age5 | 1,174 4.549404 2.512142 1 10 -------------+--------------------------------------------------------- a_age6 | 1,174 4.564736 2.493398 1 10 a_age7 | 1,174 6.473595 2.640862 1 12 a_age8 | 1,174 3.168654 1.883343 1 7 veh_no | 1,174 1.149063 .7585343 0 4 per_no | 1,174 1.663543 1.434593 1 16 -------------+--------------------------------------------------------- st_case | 1,174 430233.2 131.4876 430001 430453 year | 1,174 1990 0 1990 1990 a_ptype | 1,174 1.686542 .8115993 1 4 a_rest | 1,174 1.798126 .4999198 1 3 a_alctes | 1,174 2.425043 .8426523 1 5 -------------+--------------------------------------------------------- a_hisp | 1,174 0 0 0 0 a_rcat | 1,174 0 0 0 0 a_hrace | 1,174 0 0 0 0 a_eject | 1,174 1.020443 .1415701 1 2 a_perinj | 1,174 3.98552 2.453446 1 6 -------------+--------------------------------------------------------- a_loc | 1,174 1.367121 .7740301 1 3 by Jean Roth , jroth@nber.org , 18 Apr 2016