Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 84,510 2.823536 .9141612 1 5 a_age2 | 84,510 3.885635 1.407603 1 6 a_age3 | 84,510 7.534505 2.55898 1 13 a_age4 | 84,510 4.36604 1.904775 1 8 a_age5 | 84,510 4.655993 2.323098 1 10 -------------+--------------------------------------------------------- a_age6 | 84,510 4.667448 2.307456 1 10 a_age7 | 84,510 6.582688 2.459704 1 12 a_age8 | 84,510 3.280393 1.780384 1 7 veh_no | 84,510 1.362797 1.30853 0 51 per_no | 84,510 1.701041 2.089383 1 56 -------------+--------------------------------------------------------- st_case | 84,510 272166 162951.4 10001 560139 year | 84,510 2008 0 2008 2008 a_ptype | 84,510 1.494557 .6952301 1 5 a_rest | 84,510 1.52053 .6367097 1 3 a_alctes | 84,510 2.460005 .9967959 1 5 -------------+--------------------------------------------------------- a_hisp | 84,510 .6466572 .8927231 0 3 a_rcat | 84,510 1.038658 2.06454 0 8 a_hrace | 84,510 1.49038 2.457014 0 9 a_eject | 84,510 1.119927 .3388548 1 3 a_perinj | 84,510 3.785883 2.483615 1 6 -------------+--------------------------------------------------------- a_loc | 84,510 1.119489 .456479 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016