Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 111,457 2.687063 .948956 1 5 a_age2 | 111,457 3.600007 1.449515 1 6 a_age3 | 111,457 7.063406 2.595528 1 13 a_age4 | 111,457 3.963331 1.924173 1 8 a_age5 | 111,457 4.207075 2.346854 1 10 -------------+--------------------------------------------------------- a_age6 | 111,457 4.224024 2.32716 1 10 a_age7 | 111,457 6.120432 2.49009 1 12 a_age8 | 111,457 2.894838 1.769721 1 7 veh_no | 111,457 1.295181 .8192749 0 22 per_no | 111,457 1.713926 1.565678 1 47 -------------+--------------------------------------------------------- st_case | 111,457 271667.1 160255.1 10001 560114 year | 111,457 1987 0 1987 1987 a_ptype | 111,457 1.545008 .6951577 1 5 a_rest | 111,457 1.897099 .6126861 1 3 a_alctes | 111,457 2.599155 .9265405 1 5 -------------+--------------------------------------------------------- a_hisp | 111,457 0 0 0 0 a_rcat | 111,457 0 0 0 0 a_hrace | 111,457 0 0 0 0 a_eject | 111,457 1.133531 .3563547 1 3 a_perinj | 111,457 3.918928 2.464661 1 6 -------------+--------------------------------------------------------- a_loc | 111,457 1.144728 .5058372 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016