Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 76,510 2.832741 .9216846 1 5 a_age2 | 76,510 3.8914 1.414152 1 6 a_age3 | 76,510 7.561012 2.590915 1 13 a_age4 | 76,510 4.387819 1.921122 1 8 a_age5 | 76,510 4.68774 2.346304 1 10 -------------+--------------------------------------------------------- a_age6 | 76,510 4.698262 2.331941 1 10 a_age7 | 76,510 6.611306 2.488152 1 12 a_age8 | 76,510 3.306836 1.795782 1 7 a_age9 | 76,510 1.930166 .3236018 1 3 veh_no | 76,510 1.335472 .9744171 0 30 -------------+--------------------------------------------------------- per_no | 76,510 1.643968 1.481317 1 37 st_case | 76,510 274800.5 162026.8 10001 560116 year | 76,510 2009 0 2009 2009 a_ptype | 76,510 1.49736 .6898961 1 5 a_rest | 76,510 1.511894 .6334578 1 3 -------------+--------------------------------------------------------- a_alctes | 76,510 2.442909 1.00036 1 5 a_hisp | 76,510 .6302575 .8626502 0 3 a_rcat | 76,510 .8712848 1.74435 0 8 a_hrace | 76,510 1.391792 2.277905 0 9 a_eject | 76,510 1.118024 .3344538 1 3 -------------+--------------------------------------------------------- a_perinj | 76,510 3.785714 2.483636 1 6 a_loc | 76,510 1.121004 .4599779 1 4 by Jean Roth , jroth@nber.org , 18 Apr 2016