Summary statistics for per_aux dataset : by Jean Roth , jroth@nber.org , 22 Oct 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_age1 | 73,548 2.90874 .9181602 1 5 a_age2 | 73,548 3.993678 1.358167 1 6 a_age3 | 73,548 7.755901 2.573284 1 13 a_age4 | 73,548 4.537459 1.8855 1 8 a_age5 | 73,548 4.874612 2.333255 1 10 -------------+--------------------------------------------------------- a_age6 | 73,548 4.882648 2.32159 1 10 a_age7 | 73,548 6.802469 2.473502 1 12 a_age8 | 73,548 3.462705 1.800357 1 7 a_age9 | 73,548 1.938965 .3116 1 3 st_case | 73,548 277787 163856.8 10001 560131 -------------+--------------------------------------------------------- veh_no | 73,548 1.328901 1.015455 0 40 per_no | 73,548 1.642546 1.98592 1 51 year | 73,548 2014 0 2014 2014 a_ptype | 73,548 1.507777 .7356345 1 5 a_rest | 73,548 1.578629 .7607112 1 3 -------------+--------------------------------------------------------- a_alctes | 73,548 2.531462 1.078457 1 5 a_hisp | 73,548 .6324849 .8586765 0 3 a_rcat | 73,548 .9075162 1.795881 0 8 a_hrace | 73,548 1.380309 2.262143 0 9 a_eject | 73,548 1.109412 .3404103 1 3 -------------+--------------------------------------------------------- a_perinj | 73,548 3.778662 2.484438 1 6 a_loc | 73,548 1.16944 .5849397 1 5 by Jean Roth , jroth@nber.org , 22 Oct 2016