stata操作:xtreg y x, fe cl(cluster) nonest
nonest的作用是The nonest option makes it so that I can cluster the
standard errors across panels,注: cl是 cluster的简写。
可参考:https://www.stata.com/statalist/archive/2007-04/msg00090.html
https://www.stata.com/statalist/archive/2011-07/msg00335.html



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