917968079 发表于 2022-4-11 10:05 
reghdfe安装可以参考https://github.com/sergiocorreia/reghdfe
好的谢谢,可以回归了,但是pre期的数据都被删了,参与不了回归,这样报错的,请问是什么原因呢WARNING: Singleton observations not dropped; statistical significance is biased (link)
(MWFE estimator converged in 10 iterations)