Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,412 2.8017 .9548548 1 5 a_age2 | 1,412 3.836402 1.418519 1 6 a_age3 | 1,412 7.400142 2.512184 1 13 a_age4 | 1,412 4.229462 1.902599 1 8 a_age5 | 1,412 4.489377 2.345562 1 10 -------------+--------------------------------------------------------- a_age6 | 1,412 4.50779 2.321885 1 10 a_age7 | 1,412 6.437677 2.438691 1 12 a_age8 | 1,412 3.117564 1.771593 1 7 veh_no | 1,412 1.109773 .7319697 0 5 per_no | 1,412 1.608357 1.237388 1 12 -------------+--------------------------------------------------------- st_case | 1,412 430304 172.0252 430002 430600 year | 1,412 1988 0 1988 1988 a_ptype | 1,412 1.669263 .8120924 1 5 a_rest | 1,412 1.994334 .296393 1 3 a_alctes | 1,412 2.548867 .9049937 1 5 -------------+--------------------------------------------------------- a_hisp | 1,412 0 0 0 0 a_rcat | 1,412 0 0 0 0 a_hrace | 1,412 0 0 0 0 a_eject | 1,412 1.032578 .2235298 1 3 a_perinj | 1,412 3.92847 2.463882 1 6 -------------+--------------------------------------------------------- a_loc | 1,412 1.336402 .7402611 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016