Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 22 Oct 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 76,436 2.877165 .9157604 1 5 a_age2 | 76,436 3.953804 1.375066 1 6 a_age3 | 76,436 7.673779 2.568195 1 13 a_age4 | 76,436 4.47687 1.892016 1 8 a_age5 | 76,436 4.795554 2.325116 1 10 -------------+--------------------------------------------------------- a_age6 | 76,436 4.804974 2.311707 1 10 a_age7 | 76,436 6.722042 2.466221 1 12 a_age8 | 76,436 3.403828 1.791515 1 7 a_age9 | 76,436 1.934586 .3124283 1 3 st_case | 76,436 279043.1 162653.9 10001 560113 -------------+--------------------------------------------------------- veh_no | 76,436 1.318397 .9233329 0 31 per_no | 76,436 1.651251 1.771844 1 52 year | 76,436 2012 0 2012 2012 a_ptype | 76,436 1.509236 .7209676 1 5 a_rest | 76,436 1.585823 .752832 1 3 -------------+--------------------------------------------------------- a_alctes | 76,436 2.446073 1.01372 1 5 a_hisp | 76,436 .6428908 .883406 0 3 a_rcat | 76,436 .8814825 1.763247 0 8 a_hrace | 76,436 1.436731 2.350926 0 9 a_eject | 76,436 1.107829 .3287986 1 3 -------------+--------------------------------------------------------- a_perinj | 76,436 3.790177 2.483119 1 6 a_loc | 76,436 1.157426 .5565866 1 5 by Jean Roth , jroth@nber.org , 22 Oct 2016