Summary statistics for veh_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 45,540 2009 0 2009 2009 veh_no | 45,540 1.431467 .9889829 1 30 st_case | 45,540 276999.6 161263.9 10001 560116 a_body | 45,540 2.850988 2.260271 1 9 a_imp1 | 45,540 2.730545 1.379013 1 7 -------------+--------------------------------------------------------- a_imp2 | 45,540 2.81603 1.461156 1 7 a_vroll | 45,540 1.807729 .3940888 1 2 a_lic_s | 45,540 1.456434 .9518199 1 4 a_lic_c | 45,540 1.179776 .4494513 1 3 a_cdl_s | 45,540 1.911309 .3669753 1 3 -------------+--------------------------------------------------------- a_mc_l_s | 45,540 3.720619 .8449799 1 4 a_spveh | 45,540 1.78621 .4099848 1 2 a_sbus | 45,540 2.995718 .0904016 1 3 a_mod_yr | 45,540 2145.112 1066.176 1929 9999 a_drdis | 45,540 1.888076 .3152759 1 2 -------------+--------------------------------------------------------- a_drdro | 45,540 1.983948 .1256762 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016