Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 22 Oct 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 80,587 2.910321 .9227401 1 5 a_age2 | 80,587 3.996885 1.365402 1 6 a_age3 | 80,587 7.753993 2.581244 1 13 a_age4 | 80,587 4.540087 1.890821 1 8 a_age5 | 80,587 4.875774 2.335506 1 10 -------------+--------------------------------------------------------- a_age6 | 80,587 4.884684 2.322575 1 10 a_age7 | 80,587 6.802375 2.478044 1 12 a_age8 | 80,587 3.461712 1.800737 1 7 a_age9 | 80,587 1.937062 .3168193 1 3 st_case | 80,587 275606.8 163031.5 10001 560130 -------------+--------------------------------------------------------- veh_no | 80,587 1.389393 1.449199 0 58 per_no | 80,587 1.629097 1.835387 1 51 year | 80,587 2015 0 2015 2015 a_ptype | 80,587 1.510293 .734203 1 5 a_rest | 80,587 1.574584 .7641197 1 3 -------------+--------------------------------------------------------- a_alctes | 80,587 2.566481 1.111779 1 5 a_hisp | 80,587 .6325958 .8790554 0 3 a_rcat | 80,587 .9695981 1.936678 0 8 a_hrace | 80,587 1.425987 2.370188 0 9 a_eject | 80,587 1.101158 .3261713 1 3 -------------+--------------------------------------------------------- a_perinj | 80,587 3.822726 2.479097 1 6 a_loc | 80,587 1.170276 .5855188 1 5 by Jean Roth , jroth@nber.org , 22 Oct 2016