关于CHNS insufficient observations

附件是我用stata做的一个描述，显示了各省每年对应的样本量，按理说挺大的，我只有一个因变量，两个自变量，但是fixed effect回归出现提示是insufficient observations。 试了很久，真是没找到原因。有没有高人帮想想有什么可能的办法解决呢。先谢过~~

good

没有人回答么？？？

The technical reason is that your degrees of freedom is the number of
clusters. If you have fixed effects, you consume all of these degrees
of freedom just by the fixed effects/country dummies, and you don't
have anything left to produce standard errors on your coefficients of
interest.