Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 99,316 2.66233 .9348829 1 5 a_age2 | 99,316 3.560182 1.436365 1 6 a_age3 | 99,316 7.001309 2.544874 1 13 a_age4 | 99,316 3.908383 1.90096 1 8 a_age5 | 99,316 4.138356 2.306875 1 10 -------------+--------------------------------------------------------- a_age6 | 99,316 4.15358 2.289346 1 10 a_age7 | 99,316 6.056396 2.442865 1 12 a_age8 | 99,316 2.852562 1.748008 1 7 veh_no | 99,316 1.254984 .7758032 0 22 per_no | 99,316 1.738864 1.883573 1 50 -------------+--------------------------------------------------------- st_case | 99,316 273631.7 160090.7 10001 560152 year | 99,316 1983 0 1983 1983 a_ptype | 99,316 1.552398 .7005318 1 5 a_rest | 99,316 2.141719 .482178 1 3 a_alctes | 99,316 2.795018 .9044742 1 5 -------------+--------------------------------------------------------- a_hisp | 99,316 0 0 0 0 a_rcat | 99,316 0 0 0 0 a_hrace | 99,316 0 0 0 0 a_eject | 99,316 1.148858 .3977645 1 3 a_perinj | 99,316 3.855884 2.474552 1 6 -------------+--------------------------------------------------------- a_loc | 99,316 1.159874 .5313845 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016