Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 103,348 2.673501 .9412681 1 5 a_age2 | 103,348 3.57467 1.43828 1 6 a_age3 | 103,348 7.035956 2.548597 1 13 a_age4 | 103,348 3.929104 1.908884 1 8 a_age5 | 103,348 4.165693 2.32338 1 10 -------------+--------------------------------------------------------- a_age6 | 103,348 4.181281 2.305373 1 10 a_age7 | 103,348 6.088197 2.451912 1 12 a_age8 | 103,348 2.872363 1.756857 1 7 veh_no | 103,348 1.259986 .7538525 0 23 per_no | 103,348 1.734373 1.974912 1 47 -------------+--------------------------------------------------------- st_case | 103,348 274000.8 161358.8 10001 560140 year | 103,348 1984 0 1984 1984 a_ptype | 103,348 1.547954 .70638 1 5 a_rest | 103,348 2.129175 .5043236 1 3 a_alctes | 103,348 2.702384 .8966008 1 5 -------------+--------------------------------------------------------- a_hisp | 103,348 0 0 0 0 a_rcat | 103,348 0 0 0 0 a_hrace | 103,348 0 0 0 0 a_eject | 103,348 1.148305 .3975786 1 3 a_perinj | 103,348 3.858836 2.474125 1 6 -------------+--------------------------------------------------------- a_loc | 103,348 1.160971 .5346526 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016