Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,121 2.900089 .9593571 1 5 a_age2 | 1,121 3.928635 1.368097 1 6 a_age3 | 1,121 7.674398 2.569073 1 13 a_age4 | 1,121 4.421053 1.926614 1 8 a_age5 | 1,121 4.748439 2.424772 1 10 -------------+--------------------------------------------------------- a_age6 | 1,121 4.75736 2.412764 1 10 a_age7 | 1,121 6.70562 2.504434 1 12 a_age8 | 1,121 3.32917 1.853456 1 7 veh_no | 1,121 1.105263 .7544978 0 6 per_no | 1,121 1.456735 1.026502 1 11 -------------+--------------------------------------------------------- st_case | 1,121 430232.9 136.2859 430001 430470 year | 1,121 2001 0 2001 2001 a_ptype | 1,121 1.627119 .8172993 1 5 a_rest | 1,121 1.585192 .5542967 1 3 a_alctes | 1,121 2.09545 .9252349 1 4 -------------+--------------------------------------------------------- a_hisp | 1,121 .8831401 .9935917 0 2 a_rcat | 1,121 .44157 .4967958 0 1 a_hrace | 1,121 .44157 .4967958 0 1 a_eject | 1,121 1.087422 .3796529 1 3 a_perinj | 1,121 3.79215 2.483979 1 6 -------------+--------------------------------------------------------- a_loc | 1,121 1.353256 .7618766 1 3 by Jean Roth , jroth@nber.org , 18 Apr 2016