Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,288 2.863354 1.002697 1 5 a_age2 | 1,288 3.899068 1.443276 1 6 a_age3 | 1,288 7.590839 2.712223 1 13 a_age4 | 1,288 4.381988 1.994566 1 8 a_age5 | 1,288 4.707298 2.499208 1 10 -------------+--------------------------------------------------------- a_age6 | 1,288 4.716615 2.487196 1 10 a_age7 | 1,288 6.641304 2.615221 1 12 a_age8 | 1,288 3.281832 1.8837 1 7 veh_no | 1,288 1.093944 .6916264 0 4 per_no | 1,288 1.48913 1.022607 1 9 -------------+--------------------------------------------------------- st_case | 1,288 430274.1 154.7725 430002 430538 year | 1,288 1999 0 1999 1999 a_ptype | 1,288 1.624224 .7963223 1 5 a_rest | 1,288 1.649845 .5469986 1 3 a_alctes | 1,288 2.040373 .9252987 1 4 -------------+--------------------------------------------------------- a_hisp | 1,288 .8664596 .9914283 0 2 a_rcat | 1,288 .4332298 .4957142 0 1 a_hrace | 1,288 .4332298 .4957142 0 1 a_eject | 1,288 1.099379 .4013182 1 3 a_perinj | 1,288 3.833851 2.478571 1 6 -------------+--------------------------------------------------------- a_loc | 1,288 1.343168 .7532988 1 3 by Jean Roth , jroth@nber.org , 18 Apr 2016