Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,121 2.829616 1.011742 1 5 a_age2 | 1,121 3.833185 1.477753 1 6 a_age3 | 1,121 7.487957 2.697235 1 13 a_age4 | 1,121 4.297056 2.022657 1 8 a_age5 | 1,121 4.595897 2.503202 1 10 -------------+--------------------------------------------------------- a_age6 | 1,121 4.61463 2.479833 1 10 a_age7 | 1,121 6.527208 2.621923 1 12 a_age8 | 1,121 3.209634 1.88976 1 7 veh_no | 1,121 1.042819 .8215538 0 9 per_no | 1,121 1.556646 1.144339 1 9 -------------+--------------------------------------------------------- st_case | 1,121 430229.6 128.5329 430001 430454 year | 1,121 1982 0 1982 1982 a_ptype | 1,121 1.730598 .8684142 1 5 a_rest | 1,121 1.977698 .3168518 1 3 a_alctes | 1,121 2.639607 .6959073 1 5 -------------+--------------------------------------------------------- a_hisp | 1,121 0 0 0 0 a_rcat | 1,121 0 0 0 0 a_hrace | 1,121 0 0 0 0 a_eject | 1,121 1.033006 .1977073 1 3 a_perinj | 1,121 3.859054 2.475186 1 6 -------------+--------------------------------------------------------- a_loc | 1,121 1.429973 .8423781 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016