Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 816 2.900735 .9662778 1 5 a_age2 | 816 3.941176 1.385807 1 6 a_age3 | 816 7.681373 2.542198 1 13 a_age4 | 816 4.415441 1.930118 1 8 a_age5 | 816 4.740196 2.432631 1 10 -------------+--------------------------------------------------------- a_age6 | 816 4.757353 2.409581 1 10 a_age7 | 816 6.71201 2.484139 1 12 a_age8 | 816 3.301471 1.848839 1 7 a_age9 | 816 1.988971 .3655414 1 3 veh_no | 816 1.164216 .8154904 0 5 -------------+--------------------------------------------------------- per_no | 816 1.697304 2.162206 1 22 st_case | 816 430172.4 98.65033 430001 430347 year | 816 2009 0 2009 2009 a_ptype | 816 1.63848 .8794531 1 5 a_rest | 816 1.616422 .554889 1 3 -------------+--------------------------------------------------------- a_alctes | 816 1.965686 .9327308 1 4 a_hisp | 816 .8946078 .9950406 0 2 a_rcat | 816 .4571078 .5177805 0 2 a_hrace | 816 .4473039 .4975203 0 1 a_eject | 816 1.094363 .39589 1 3 -------------+--------------------------------------------------------- a_perinj | 816 3.76348 2.487602 1 6 a_loc | 816 1.341912 .7525879 1 3 by Jean Roth , jroth@nber.org , 18 Apr 2016