Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,114 2.916517 .9700067 1 5 a_age2 | 1,114 3.966786 1.372222 1 6 a_age3 | 1,114 7.706463 2.5957 1 13 a_age4 | 1,114 4.447038 1.921032 1 8 a_age5 | 1,114 4.788151 2.439198 1 10 -------------+--------------------------------------------------------- a_age6 | 1,114 4.792639 2.433131 1 10 a_age7 | 1,114 6.745961 2.516631 1 12 a_age8 | 1,114 3.337522 1.858201 1 7 veh_no | 1,114 1.10772 .6946553 0 4 per_no | 1,114 1.443447 .9378423 1 10 -------------+--------------------------------------------------------- st_case | 1,114 430235.2 136.7558 430001 430472 year | 1,114 2003 0 2003 2003 a_ptype | 1,114 1.597846 .7997275 1 5 a_rest | 1,114 1.560144 .5595454 1 3 a_alctes | 1,114 1.990126 .9281905 1 4 -------------+--------------------------------------------------------- a_hisp | 1,114 .8886894 .994232 0 2 a_rcat | 1,114 .4443447 .497116 0 1 a_hrace | 1,114 .4443447 .497116 0 1 a_eject | 1,114 1.099641 .3953229 1 3 a_perinj | 1,114 3.778276 2.48558 1 6 -------------+--------------------------------------------------------- a_loc | 1,114 1.314183 .7231482 1 3 by Jean Roth , jroth@nber.org , 18 Apr 2016