请教各位大神，

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 collinearity
note: 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？