Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 98,945 2.715034 .9541513 1 5 a_age2 | 98,945 3.677477 1.478732 1 6 a_age3 | 98,945 7.196281 2.676622 1 13 a_age4 | 98,945 4.090757 1.969233 1 8 a_age5 | 98,945 4.356188 2.397549 1 10 -------------+--------------------------------------------------------- a_age6 | 98,945 4.372621 2.377834 1 10 a_age7 | 98,945 6.259629 2.559345 1 12 a_age8 | 98,945 3.034565 1.789733 1 7 veh_no | 98,945 1.303906 .7392198 0 14 per_no | 98,945 1.754429 1.734975 1 46 -------------+--------------------------------------------------------- st_case | 98,945 269353.8 161226.3 10001 560135 year | 98,945 1994 0 1994 1994 a_ptype | 98,945 1.540583 .6913905 1 5 a_rest | 98,945 1.668654 .6389756 1 3 a_alctes | 98,945 2.613482 1.016092 1 5 -------------+--------------------------------------------------------- a_hisp | 98,945 0 0 0 0 a_rcat | 98,945 0 0 0 0 a_hrace | 98,945 0 0 0 0 a_eject | 98,945 1.132902 .3552692 1 3 a_perinj | 98,945 3.942493 2.460541 1 6 -------------+--------------------------------------------------------- a_loc | 98,945 1.133812 .486542 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016