Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 103,347 2.724482 .9568461 1 5 a_age2 | 103,347 3.701617 1.485758 1 6 a_age3 | 103,347 7.232547 2.681776 1 13 a_age4 | 103,347 4.122035 1.97535 1 8 a_age5 | 103,347 4.391052 2.40389 1 10 -------------+--------------------------------------------------------- a_age6 | 103,347 4.40843 2.382834 1 10 a_age7 | 103,347 6.295074 2.565442 1 12 a_age8 | 103,347 3.058454 1.795336 1 7 veh_no | 103,347 1.348118 1.064342 0 47 per_no | 103,347 1.767211 1.809165 1 60 -------------+--------------------------------------------------------- st_case | 103,347 273877.1 161444.8 10001 560121 year | 103,347 1996 0 1996 1996 a_ptype | 103,347 1.534558 .6802997 1 5 a_rest | 103,347 1.64656 .6442973 1 3 a_alctes | 103,347 2.625282 1.004078 1 5 -------------+--------------------------------------------------------- a_hisp | 103,347 0 0 0 0 a_rcat | 103,347 0 0 0 0 a_hrace | 103,347 0 0 0 0 a_eject | 103,347 1.130821 .3537866 1 3 a_perinj | 103,347 3.964866 2.456412 1 6 -------------+--------------------------------------------------------- a_loc | 103,347 1.123332 .4651875 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016