黃河泉 发表于 2020-3-2 07:11 
可能是,太久了,我也忘了!
能不能麻烦老师推荐一个关于reghdfe命令学习的指南,书籍,用大家说的命令跑出来 结果了,无论是
reghdfe y x,absorb(i.year id_h) cluster(id_h)
reghdfe y x ,absorb(i.year id_h ) vce( cl id_h )
都出结果了,但是不会看结果,不知道吸收自由度什么意思,
Absorbed degrees of freedom:
-----------------------------------------------------+
Absorbed FE | Categories - Redundant = Num. Coefs |
-------------+---------------------------------------|
des_year | 1064 0 1064 |
id_s| 6685 6685 0 *|
-----------------------------------------------------+
* = FE nested within cluster; treated as redundant for DoF computation