tsset id year
do "C:\pvar ado\helm.ado"
helm x1 x2 x3
do "C:\pvar ado\sgmm.ado"
do "C:\pvar ado\pvar.ado"
pvar x1 x2 x3, lag(2) gmm impulse monte 500 decomp (30)
我按这个操作步骤执行,执行到helm x1 x2 x3 (这是三个变量吧,可以根据设置变量而改变名称吧?),结果显示variable id not found
r(111);请问是怎么回事啊?请各位大虾多指教,谢谢!