求大神解答啊啊啊

我匹配好公司-年度-独立董事姓名后，跑logit模型，对年度、公司个体、独立董事个体进行固定效应，但stata报错：
no room to add more variables
    Up to 5,000 variables are currently allowed, although you could reset the maximum using set maxvar; see help
    memory.