Summary statistics for veh_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 60,792 1986 0 1986 1986 veh_no | 60,792 1.390874 .6927773 1 24 st_case | 60,792 274273.2 160366.2 10001 560150 a_body | 60,792 2.433297 2.2722 1 9 a_imp1 | 60,792 2.634985 1.34184 1 7 -------------+--------------------------------------------------------- a_imp2 | 60,792 2.727004 1.417266 1 7 a_vroll | 60,792 1.835751 .370504 1 2 a_lic_s | 60,792 1.384031 .8723764 1 4 a_lic_c | 60,792 1.196013 .4859615 1 3 a_cdl_s | 60,792 3 0 3 3 -------------+--------------------------------------------------------- a_mc_l_s | 60,792 3.924826 .2636747 3 4 a_spveh | 60,792 1.754573 .4303436 1 2 a_sbus | 60,792 2.996463 .082747 1 3 a_mod_yr | 60,792 2168.821 1218.804 1900 9999 a_drdis | 60,792 1.924414 .2643361 1 2 -------------+--------------------------------------------------------- a_drdro | 60,792 1.978517 .1449894 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016