Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 101,262 2.781972 .9284895 1 5 a_age2 | 101,262 3.822174 1.440693 1 6 a_age3 | 101,262 7.424453 2.600549 1 13 a_age4 | 101,262 4.280767 1.931794 1 8 a_age5 | 101,262 4.559479 2.347404 1 10 -------------+--------------------------------------------------------- a_age6 | 101,262 4.572169 2.330772 1 10 a_age7 | 101,262 6.479015 2.492304 1 12 a_age8 | 101,262 3.207491 1.781026 1 7 veh_no | 101,262 1.349381 .8096763 0 20 per_no | 101,262 1.709407 1.846097 1 48 -------------+--------------------------------------------------------- st_case | 101,262 268072.1 162588.2 10001 560147 year | 101,262 2005 0 2005 2005 a_ptype | 101,262 1.49919 .6819747 1 5 a_rest | 101,262 1.531058 .6379237 1 3 a_alctes | 101,262 2.596818 1.007121 1 5 -------------+--------------------------------------------------------- a_hisp | 101,262 .5979044 .8310593 0 3 a_rcat | 101,262 .9045051 1.851336 0 8 a_hrace | 101,262 1.291531 2.186378 0 9 a_eject | 101,262 1.125091 .3472238 1 3 a_perinj | 101,262 3.851613 2.475162 1 6 -------------+--------------------------------------------------------- a_loc | 101,262 1.110515 .4435998 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016