Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,318 2.845979 1.04701 1 5 a_age2 | 1,318 3.854325 1.488001 1 6 a_age3 | 1,318 7.471927 2.78357 1 13 a_age4 | 1,318 4.300455 2.023593 1 8 a_age5 | 1,318 4.616085 2.533262 1 10 -------------+--------------------------------------------------------- a_age6 | 1,318 4.628983 2.517301 1 10 a_age7 | 1,318 6.53566 2.668444 1 12 a_age8 | 1,318 3.2261 1.881174 1 7 veh_no | 1,318 1.040212 .7073047 0 3 per_no | 1,318 2.592564 5.812053 1 52 -------------+--------------------------------------------------------- st_case | 1,318 430240.8 141.4274 430001 430494 year | 1,318 1983 0 1983 1983 a_ptype | 1,318 1.746586 .8291205 1 5 a_rest | 1,318 1.993171 .3005166 1 3 a_alctes | 1,318 2.518968 .749095 1 5 -------------+--------------------------------------------------------- a_hisp | 1,318 0 0 0 0 a_rcat | 1,318 0 0 0 0 a_hrace | 1,318 0 0 0 0 a_eject | 1,318 1.012898 .1128788 1 2 a_perinj | 1,318 4.050076 2.439658 1 6 -------------+--------------------------------------------------------- a_loc | 1,318 1.397572 .7994266 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016