Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,077 2.908078 1.012882 1 5 a_age2 | 1,077 3.910864 1.432315 1 6 a_age3 | 1,077 7.699164 2.687319 1 13 a_age4 | 1,077 4.413185 2.014615 1 8 a_age5 | 1,077 4.768802 2.557414 1 10 -------------+--------------------------------------------------------- a_age6 | 1,077 4.785515 2.535886 1 10 a_age7 | 1,077 6.727948 2.629418 1 12 a_age8 | 1,077 3.343547 1.933102 1 7 veh_no | 1,077 1.090994 .71695 0 5 per_no | 1,077 1.401114 .8341674 1 7 -------------+--------------------------------------------------------- st_case | 1,077 430232.1 134.2115 430001 430470 year | 1,077 2004 0 2004 2004 a_ptype | 1,077 1.615599 .8139456 1 4 a_rest | 1,077 1.610956 .5863937 1 3 a_alctes | 1,077 2.038069 .9253951 1 4 -------------+--------------------------------------------------------- a_hisp | 1,077 .9192201 .997195 0 2 a_rcat | 1,077 .45961 .4985975 0 1 a_hrace | 1,077 .45961 .4985975 0 1 a_eject | 1,077 1.125348 .4644199 1 3 a_perinj | 1,077 3.70195 2.492988 1 6 -------------+--------------------------------------------------------- a_loc | 1,077 1.358403 .7673982 1 3 by Jean Roth , jroth@nber.org , 18 Apr 2016