Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 101,784 2.755276 .9359763 1 5 a_age2 | 101,784 3.767321 1.462796 1 6 a_age3 | 101,784 7.348591 2.625023 1 13 a_age4 | 101,784 4.21021 1.954606 1 8 a_age5 | 101,784 4.484732 2.377222 1 10 -------------+--------------------------------------------------------- a_age6 | 101,784 4.498998 2.359199 1 10 a_age7 | 101,784 6.403796 2.518821 1 12 a_age8 | 101,784 3.144473 1.791502 1 7 veh_no | 101,784 1.386397 1.490191 0 58 per_no | 101,784 1.744675 1.887283 1 55 -------------+--------------------------------------------------------- st_case | 101,784 272973 162142.4 10001 560151 year | 101,784 2002 0 2002 2002 a_ptype | 101,784 1.505728 .6621103 1 5 a_rest | 101,784 1.572104 .6409397 1 3 a_alctes | 101,784 2.583972 1.024034 1 5 -------------+--------------------------------------------------------- a_hisp | 101,784 .5686257 .7970072 0 3 a_rcat | 101,784 .8322526 1.723142 0 8 a_hrace | 101,784 1.224868 2.072142 0 9 a_eject | 101,784 1.137409 .362436 1 3 a_perinj | 101,784 3.887438 2.469808 1 6 -------------+--------------------------------------------------------- a_loc | 101,784 1.112238 .4467212 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016