Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 109,866 2.707425 .9455262 1 5 a_age2 | 109,866 3.641309 1.452087 1 6 a_age3 | 109,866 7.119719 2.61727 1 13 a_age4 | 109,866 4.020589 1.93031 1 8 a_age5 | 109,866 4.270957 2.3533 1 10 -------------+--------------------------------------------------------- a_age6 | 109,866 4.285129 2.336511 1 10 a_age7 | 109,866 6.179592 2.505937 1 12 a_age8 | 109,866 2.951377 1.776099 1 7 veh_no | 109,866 1.310815 1.021002 0 43 per_no | 109,866 1.770457 2.220019 1 82 -------------+--------------------------------------------------------- st_case | 109,866 270782.8 160854.9 10001 560114 year | 109,866 1989 0 1989 1989 a_ptype | 109,866 1.543635 .691032 1 5 a_rest | 109,866 1.819362 .6132612 1 3 a_alctes | 109,866 2.569339 .9394845 1 5 -------------+--------------------------------------------------------- a_hisp | 109,866 0 0 0 0 a_rcat | 109,866 0 0 0 0 a_hrace | 109,866 0 0 0 0 a_eject | 109,866 1.137422 .3628796 1 3 a_perinj | 109,866 3.925564 2.463524 1 6 -------------+--------------------------------------------------------- a_loc | 109,866 1.139889 .4966648 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016