我想在门槛效应模型中同时控制时间效应和行业效应
控制时间效应的命令为xi:xthreg y x1 x2 x3 x4 i.year, rx(Fin) qx(Fin) thnum(1) trim(0.01) grid(400) bs(300),该命令可以运行。
控制时间效应和行业效应的命令为:xi:xthreg y x1 x2 x3 x4 i.Industry i.year, rx(Fin) qx(Fin) thnum(1) trim(0.01) grid(400) bs(300),该命令运行时报错:There exist time-invaying variable: _IIndustry_2
There exist time-invaying variable: _IIndustry_3
There exist time-invaying variable: _IIndustry_4
There exist time-invaying variable: _IIndustry_5
There exist time-invaying variable: _IIndustry_6
There exist time-invaying variable: _IIndustry_7
There exist time-invaying variable: _IIndustry_8
There exist time-invaying variable: _IIndustry_9
There exist time-invaying variable: _IIndustry_10
请问是什么原因?如何在门槛效应模型中控制行业变量?多谢各位指教!


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