Summary statistics for veh_aux dataset : by Jean Roth , jroth@nber.org , 22 Oct 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 44,950 2014 0 2014 2014 st_case | 44,950 279497.4 162913.2 10001 560131 veh_no | 44,950 1.443137 1.002901 1 40 a_body | 44,950 2.935328 2.311505 1 9 a_imp1 | 44,950 2.75584 1.458216 1 7 -------------+--------------------------------------------------------- a_imp2 | 0 a_vroll | 44,950 1.830545 .3751574 1 2 a_lic_s | 44,950 1.480756 .9679375 1 4 a_lic_c | 44,950 1.201824 .4733445 1 3 a_cdl_s | 44,950 1.905339 .3839484 1 3 -------------+--------------------------------------------------------- a_mc_l_s | 44,950 3.716908 .8419396 1 4 a_spveh | 44,950 1.813281 .3896898 1 2 a_sbus | 44,950 2.99584 .0905096 1 3 a_mod_yr | 44,950 2172.255 1148.225 1927 9999 a_drdis | 44,950 1.968743 .1740133 1 2 -------------+--------------------------------------------------------- a_drdro | 44,950 1.983359 .1279225 1 2 by Jean Roth , jroth@nber.org , 22 Oct 2016