Summary statistics for veh_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 725 1999 0 1999 1999 veh_no | 725 1.295172 .5187548 1 4 st_case | 725 430269.6 154.242 430002 430538 a_body | 725 2.497931 2.431165 1 9 a_imp1 | 725 2.591724 1.113175 1 5 -------------+--------------------------------------------------------- a_imp2 | 725 2.693793 1.247108 1 6 a_vroll | 725 1.947586 .2230139 1 2 a_lic_s | 725 1.398621 .8374839 1 4 a_lic_c | 725 1.277241 .5891216 1 3 a_cdl_s | 725 2.070345 .2664801 1 3 -------------+--------------------------------------------------------- a_mc_l_s | 725 3.851034 .6393104 1 4 a_spveh | 725 1.646897 .4782645 1 2 a_sbus | 725 2.994483 .1049726 1 3 a_mod_yr | 725 2575.756 2086.165 1962 9999 a_drdis | 725 1.998621 .0371391 1 2 -------------+--------------------------------------------------------- a_drdro | 725 1.998621 .0371391 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016