Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 104,045 2.688087 .9527821 1 5 a_age2 | 104,045 3.601528 1.444296 1 6 a_age3 | 104,045 7.076698 2.582948 1 13 a_age4 | 104,045 3.965544 1.922645 1 8 a_age5 | 104,045 4.211351 2.349267 1 10 -------------+--------------------------------------------------------- a_age6 | 104,045 4.227815 2.330129 1 10 a_age7 | 104,045 6.130444 2.48331 1 12 a_age8 | 104,045 2.903657 1.771983 1 7 veh_no | 104,045 1.299822 1.011335 0 36 per_no | 104,045 1.741794 2.073308 1 75 -------------+--------------------------------------------------------- st_case | 104,045 274234.3 160711.5 10002 560136 year | 104,045 1985 0 1985 1985 a_ptype | 104,045 1.540737 .6911777 1 5 a_rest | 104,045 2.068826 .5669588 1 3 a_alctes | 104,045 2.633889 .905804 1 5 -------------+--------------------------------------------------------- a_hisp | 104,045 0 0 0 0 a_rcat | 104,045 0 0 0 0 a_hrace | 104,045 0 0 0 0 a_eject | 104,045 1.123889 .3435656 1 3 a_perinj | 104,045 3.89394 2.468779 1 6 -------------+--------------------------------------------------------- a_loc | 104,045 1.149301 .5117019 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016