求助！Stata 16 SEtobit 回归中标准误命令出错
代码  r和bootstrap 都跑不出来
tobit ln_citations ln_Inv_num  ROA PPE Cash lnSize Lev Growth i.year  , ll(0) robust
option robust not allowed

tobit ln_citations ln_Inv_num  ROA PPE Cash lnSize Lev Growth i.year  , ll(0) r
option r not allowed

tobit ln_citations ln_Inv_num  ROA PPE Cash lnSize Lev Growth i.year  , ll(0)  vce(bootstrap，reps(300))
vcetype 'bootstrap，reps(300)' not allowed