Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 101,862 2.758742 .9382632 1 5 a_age2 | 101,862 3.781214 1.465112 1 6 a_age3 | 101,862 7.365681 2.632159 1 13 a_age4 | 101,862 4.230194 1.954993 1 8 a_age5 | 101,862 4.506607 2.374532 1 10 -------------+--------------------------------------------------------- a_age6 | 101,862 4.52092 2.356295 1 10 a_age7 | 101,862 6.422915 2.521706 1 12 a_age8 | 101,862 3.167805 1.788705 1 7 veh_no | 101,862 1.366417 1.110013 0 45 per_no | 101,862 1.757662 2.001401 1 74 -------------+--------------------------------------------------------- st_case | 101,862 271299 162324.5 10001 560141 year | 101,862 2003 0 2003 2003 a_ptype | 101,862 1.50375 .668112 1 5 a_rest | 101,862 1.554387 .6448742 1 3 a_alctes | 101,862 2.578832 1.023019 1 5 -------------+--------------------------------------------------------- a_hisp | 101,862 .5475938 .7596114 0 3 a_rcat | 101,862 .7764819 1.600941 0 8 a_hrace | 101,862 1.149889 1.924365 0 9 a_eject | 101,862 1.129047 .3537484 1 3 a_perinj | 101,862 3.894995 2.468611 1 6 -------------+--------------------------------------------------------- a_loc | 101,862 1.112613 .4475978 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016