Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 100,716 2.742861 .9401312 1 5 a_age2 | 100,716 3.750576 1.473576 1 6 a_age3 | 100,716 7.305661 2.641417 1 13 a_age4 | 100,716 4.183427 1.958785 1 8 a_age5 | 100,716 4.45252 2.377925 1 10 -------------+--------------------------------------------------------- a_age6 | 100,716 4.466986 2.359851 1 10 a_age7 | 100,716 6.364659 2.529583 1 12 a_age8 | 100,716 3.11595 1.786583 1 7 veh_no | 100,716 1.354353 .892118 0 32 per_no | 100,716 1.730341 1.624513 1 41 -------------+--------------------------------------------------------- st_case | 100,716 274814.5 161963.3 10001 560132 year | 100,716 2000 0 2000 2000 a_ptype | 100,716 1.511299 .6727004 1 5 a_rest | 100,716 1.593689 .6443608 1 3 a_alctes | 100,716 2.635381 1.054891 1 5 -------------+--------------------------------------------------------- a_hisp | 100,716 .6521903 .9485092 0 3 a_rcat | 100,716 1.089301 2.207947 0 8 a_hrace | 100,716 1.566772 2.657425 0 9 a_eject | 100,716 1.132998 .3542565 1 3 a_perinj | 100,716 3.91766 2.464877 1 6 -------------+--------------------------------------------------------- a_loc | 100,716 1.11309 .4473124 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016