Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 102,197 2.743652 .955025 1 5 a_age2 | 102,197 3.733319 1.48371 1 6 a_age3 | 102,197 7.293825 2.682318 1 13 a_age4 | 102,197 4.16934 1.978349 1 8 a_age5 | 102,197 4.447273 2.41156 1 10 -------------+--------------------------------------------------------- a_age6 | 102,197 4.463477 2.391619 1 10 a_age7 | 102,197 6.355343 2.567685 1 12 a_age8 | 102,197 3.103349 1.803235 1 7 veh_no | 102,197 1.326184 .8585167 0 37 per_no | 102,197 1.743495 1.610473 1 42 -------------+--------------------------------------------------------- st_case | 102,197 275239.5 160557.5 10001 560118 year | 102,197 1997 0 1997 1997 a_ptype | 102,197 1.533509 .6868658 1 5 a_rest | 102,197 1.63587 .645944 1 3 a_alctes | 102,197 2.625468 1.024326 1 5 -------------+--------------------------------------------------------- a_hisp | 102,197 0 0 0 0 a_rcat | 102,197 0 0 0 0 a_hrace | 102,197 0 0 0 0 a_eject | 102,197 1.130053 .3509138 1 3 a_perinj | 102,197 3.944509 2.460177 1 6 -------------+--------------------------------------------------------- a_loc | 102,197 1.125356 .4705407 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016