Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 1,438 2.778164 .9643017 1 5 a_age2 | 1,438 3.794854 1.437756 1 6 a_age3 | 1,438 7.311544 2.588776 1 13 a_age4 | 1,438 4.187065 1.918427 1 8 a_age5 | 1,438 4.441586 2.348928 1 10 -------------+--------------------------------------------------------- a_age6 | 1,438 4.461752 2.32343 1 10 a_age7 | 1,438 6.366481 2.482207 1 12 a_age8 | 1,438 3.090403 1.78571 1 7 veh_no | 1,438 1.077191 .7312642 0 4 per_no | 1,438 1.661335 1.259085 1 12 -------------+--------------------------------------------------------- st_case | 1,438 430287.6 170.6921 430001 430587 year | 1,438 1986 0 1986 1986 a_ptype | 1,438 1.713491 .8490685 1 5 a_rest | 1,438 1.975661 .2717864 1 3 a_alctes | 1,438 2.490264 .7858189 1 5 -------------+--------------------------------------------------------- a_hisp | 1,438 0 0 0 0 a_rcat | 1,438 0 0 0 0 a_hrace | 1,438 0 0 0 0 a_eject | 1,438 1.013908 .1171508 1 2 a_perinj | 1,438 3.941586 2.461547 1 6 -------------+--------------------------------------------------------- a_loc | 1,438 1.38178 .7858361 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016