Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 100,760 2.75921 .934628 1 5 a_age2 | 100,760 3.780439 1.458945 1 6 a_age3 | 100,760 7.36574 2.61815 1 13 a_age4 | 100,760 4.229307 1.948653 1 8 a_age5 | 100,760 4.503881 2.364506 1 10 -------------+--------------------------------------------------------- a_age6 | 100,760 4.518102 2.346326 1 10 a_age7 | 100,760 6.421775 2.50939 1 12 a_age8 | 100,760 3.162426 1.787436 1 7 veh_no | 100,760 1.36314 .992057 0 42 per_no | 100,760 1.726786 1.792919 1 47 -------------+--------------------------------------------------------- st_case | 100,760 268860.4 163174.2 10001 560142 year | 100,760 2004 0 2004 2004 a_ptype | 100,760 1.496397 .6619525 1 5 a_rest | 100,760 1.534905 .6349273 1 3 a_alctes | 100,760 2.576558 1.008944 1 5 -------------+--------------------------------------------------------- a_hisp | 100,760 .5844283 .8182153 0 3 a_rcat | 100,760 .8967745 1.847035 0 8 a_hrace | 100,760 1.26579 2.154064 0 9 a_eject | 100,760 1.126608 .3496721 1 3 a_perinj | 100,760 3.874355 2.471825 1 6 -------------+--------------------------------------------------------- a_loc | 100,760 1.109875 .4425598 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016