Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,110 2.916216 .9726689 1 5 a_age2 | 1,110 3.90991 1.367203 1 6 a_age3 | 1,110 7.688288 2.615441 1 13 a_age4 | 1,110 4.405405 1.947824 1 8 a_age5 | 1,110 4.756757 2.483911 1 10 -------------+--------------------------------------------------------- a_age6 | 1,110 4.767568 2.469659 1 10 a_age7 | 1,110 6.717117 2.556693 1 12 a_age8 | 1,110 3.30991 1.900925 1 7 veh_no | 1,110 1.07027 .6864126 0 3 per_no | 1,110 1.363063 .8050145 1 7 -------------+--------------------------------------------------------- st_case | 1,110 430246.9 144.0531 430001 430494 year | 1,110 2002 0 2002 2002 a_ptype | 1,110 1.609009 .8323432 1 5 a_rest | 1,110 1.59009 .5653753 1 3 a_alctes | 1,110 1.943243 .9213549 1 4 -------------+--------------------------------------------------------- a_hisp | 1,110 .9333333 .9982251 0 2 a_rcat | 1,110 .4666667 .4991125 0 1 a_hrace | 1,110 .4666667 .4991125 0 1 a_eject | 1,110 1.095495 .4049708 1 3 a_perinj | 1,110 3.666667 2.495563 1 6 -------------+--------------------------------------------------------- a_loc | 1,110 1.368468 .7751182 1 3 by Jean Roth , jroth@nber.org , 18 Apr 2016