Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,333 2.88072 1.019345 1 5 a_age2 | 1,333 3.876969 1.457564 1 6 a_age3 | 1,333 7.627907 2.778813 1 13 a_age4 | 1,333 4.379595 2.043066 1 8 a_age5 | 1,333 4.731433 2.587776 1 10 -------------+--------------------------------------------------------- a_age6 | 1,333 4.743436 2.572705 1 10 a_age7 | 1,333 6.669917 2.694501 1 12 a_age8 | 1,333 3.288822 1.951707 1 7 veh_no | 1,333 1.137284 .7133839 0 4 per_no | 1,333 1.750938 2.278525 1 27 -------------+--------------------------------------------------------- st_case | 1,333 430259.4 148.2148 430001 430521 year | 1,333 2000 0 2000 2000 a_ptype | 1,333 1.635409 .7821242 1 5 a_rest | 1,333 1.613653 .5425108 1 3 a_alctes | 1,333 2.054764 .9384201 1 4 -------------+--------------------------------------------------------- a_hisp | 1,333 .8522131 .9893904 0 2 a_rcat | 1,333 .4261065 .4946952 0 1 a_hrace | 1,333 .4261065 .4946952 0 1 a_eject | 1,333 1.085521 .3678631 1 3 a_perinj | 1,333 3.869467 2.473476 1 6 -------------+--------------------------------------------------------- a_loc | 1,333 1.330083 .7417027 1 3 by Jean Roth , jroth@nber.org , 18 Apr 2016