Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,078 2.974954 .9598842 1 5 a_age2 | 1,078 4.054731 1.360598 1 6 a_age3 | 1,078 7.866419 2.595397 1 13 a_age4 | 1,078 4.571429 1.915581 1 8 a_age5 | 1,078 4.940631 2.449907 1 10 -------------+--------------------------------------------------------- a_age6 | 1,078 4.94898 2.438128 1 10 a_age7 | 1,078 6.895176 2.53502 1 12 a_age8 | 1,078 3.444341 1.873472 1 7 veh_no | 1,078 1.152134 .8836964 0 8 per_no | 1,078 1.422078 .9669346 1 9 -------------+--------------------------------------------------------- st_case | 1,078 430248.6 143.554 430001 430487 year | 1,078 2006 0 2006 2006 a_ptype | 1,078 1.593692 .8553926 1 5 a_rest | 1,078 1.541744 .5598958 1 3 a_alctes | 1,078 1.925788 .9232693 1 4 -------------+--------------------------------------------------------- a_hisp | 1,078 .9443414 .9989133 0 2 a_rcat | 1,078 .4768089 .5088996 0 2 a_hrace | 1,078 .4721707 .4994566 0 1 a_eject | 1,078 1.105751 .3995638 1 3 a_perinj | 1,078 3.639147 2.497283 1 6 -------------+--------------------------------------------------------- a_loc | 1,078 1.318182 .7235677 1 3 by Jean Roth , jroth@nber.org , 18 Apr 2016