Hi

I ran the following code :

Code:
xi: qreg price i.treatment i.state i.year  [pw=round(weight)] if  !inlist(state,3,8,15,27,33,28) ,  vce(robust)
grqreg  _Itreatment_1,  ci ols olsci

But it shows the error:

o._Istate_3 invalid name
r(198);


Could someone help with the reason for the error