tsset id year
xtreg y x i.industry i.year,fe
进行固定效应模型回归后,出现行业被omitted的情况,
note: 3.industry omitted because of collinearitynote: 8.industry omitted because of collinearity
note: 12.industry omitted because of collinearity
note: 20.industry omitted because of collinearity
note: 36.industry omitted because of collinearity
note: 43.industry omitted because of collinearity
note: 44.industry omitted because of collinearity
请问这种情况该怎么处理,具体stata命令是什么?


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