Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 95,691 2.71664 .958768 1 5 a_age2 | 95,691 3.673961 1.471273 1 6 a_age3 | 95,691 7.18147 2.667688 1 13 a_age4 | 95,691 4.077384 1.959347 1 8 a_age5 | 95,691 4.340795 2.389747 1 10 -------------+--------------------------------------------------------- a_age6 | 95,691 4.357129 2.370195 1 10 a_age7 | 95,691 6.244913 2.550303 1 12 a_age8 | 95,691 3.017661 1.785452 1 7 veh_no | 95,691 1.30356 .8621351 0 38 per_no | 95,691 1.830026 2.336649 1 79 -------------+--------------------------------------------------------- st_case | 95,691 271323.3 161263.7 10001 560099 year | 95,691 1992 0 1992 1992 a_ptype | 95,691 1.550992 .6904839 1 5 a_rest | 95,691 1.736976 .6395944 1 3 a_alctes | 95,691 2.616453 1.001895 1 5 -------------+--------------------------------------------------------- a_hisp | 95,691 0 0 0 0 a_rcat | 95,691 0 0 0 0 a_hrace | 95,691 0 0 0 0 a_eject | 95,691 1.130096 .3512431 1 3 a_perinj | 95,691 3.949128 2.459339 1 6 -------------+--------------------------------------------------------- a_loc | 95,691 1.139397 .4962982 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016