Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,473 2.813985 .9544774 1 5 a_age2 | 1,473 3.830278 1.417469 1 6 a_age3 | 1,473 7.398506 2.544319 1 13 a_age4 | 1,473 4.232179 1.911883 1 8 a_age5 | 1,473 4.497624 2.361121 1 10 -------------+--------------------------------------------------------- a_age6 | 1,473 4.509165 2.346385 1 10 a_age7 | 1,473 6.441955 2.46046 1 12 a_age8 | 1,473 3.124915 1.792007 1 7 veh_no | 1,473 1.067889 .746919 0 5 per_no | 1,473 1.555329 1.12884 1 10 -------------+--------------------------------------------------------- st_case | 1,473 430288.4 168.0866 430001 430593 year | 1,473 1987 0 1987 1987 a_ptype | 1,473 1.697895 .8407762 1 5 a_rest | 1,473 1.98778 .2946304 1 3 a_alctes | 1,473 2.418194 .8260338 1 5 -------------+--------------------------------------------------------- a_hisp | 1,473 0 0 0 0 a_rcat | 1,473 0 0 0 0 a_hrace | 1,473 0 0 0 0 a_eject | 1,473 1.017651 .1367844 1 3 a_perinj | 1,473 3.915818 2.466014 1 6 -------------+--------------------------------------------------------- a_loc | 1,473 1.393075 .7928902 1 3 by Jean Roth , jroth@nber.org , 18 Apr 2016