Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,453 2.832072 1.029531 1 5 a_age2 | 1,453 3.825877 1.489853 1 6 a_age3 | 1,453 7.475568 2.784795 1 13 a_age4 | 1,453 4.291122 2.041892 1 8 a_age5 | 1,453 4.608396 2.547372 1 10 -------------+--------------------------------------------------------- a_age6 | 1,453 4.622161 2.530471 1 10 a_age7 | 1,453 6.528562 2.683752 1 12 a_age8 | 1,453 3.209222 1.890675 1 7 veh_no | 1,453 1.108052 .730125 0 4 per_no | 1,453 1.66552 1.47183 1 14 -------------+--------------------------------------------------------- st_case | 1,453 430281.8 160.0158 430001 430567 year | 1,453 1993 0 1993 1993 a_ptype | 1,453 1.676531 .8062983 1 5 a_rest | 1,453 1.714384 .5342726 1 3 a_alctes | 1,453 2.194769 .8906772 1 4 -------------+--------------------------------------------------------- a_hisp | 1,453 0 0 0 0 a_rcat | 1,453 0 0 0 0 a_hrace | 1,453 0 0 0 0 a_eject | 1,453 1.113558 .4266137 1 3 a_perinj | 1,453 3.935306 2.462658 1 6 -------------+--------------------------------------------------------- a_loc | 1,453 1.363386 .7705549 1 3 by Jean Roth , jroth@nber.org , 18 Apr 2016