Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 99,369 2.714821 .9508522 1 5 a_age2 | 99,369 3.659914 1.458208 1 6 a_age3 | 99,369 7.155682 2.639395 1 13 a_age4 | 99,369 4.049422 1.942403 1 8 a_age5 | 99,369 4.307591 2.374059 1 10 -------------+--------------------------------------------------------- a_age6 | 99,369 4.322646 2.356139 1 10 a_age7 | 99,369 6.215611 2.52798 1 12 a_age8 | 99,369 2.986666 1.77841 1 7 veh_no | 99,369 1.305005 .9119182 0 30 per_no | 99,369 1.755648 1.875594 1 57 -------------+--------------------------------------------------------- st_case | 99,369 270690.5 161683.2 10001 560107 year | 99,369 1991 0 1991 1991 a_ptype | 99,369 1.547112 .6927844 1 5 a_rest | 99,369 1.765883 .6325215 1 3 a_alctes | 99,369 2.607644 1.024294 1 5 -------------+--------------------------------------------------------- a_hisp | 99,369 0 0 0 0 a_rcat | 99,369 0 0 0 0 a_hrace | 99,369 0 0 0 0 a_eject | 99,369 1.136038 .3585566 1 3 a_perinj | 99,369 3.911421 2.465927 1 6 -------------+--------------------------------------------------------- a_loc | 99,369 1.140396 .4979058 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016