求助大虾，本人stata菜鸟一枚，这两天急需用这个做出个结果。设定模型为多元回归，ownership，lnrevenue，cs，location这四个作为控制变量，croa为被解释变量，其余为解释变量。检验各个解释变量是否对被解释变量有解释力。输入命令xtreg后，出现如图问题。“must specify panelvar; use xtset”。改用xtset命令也不行“factor variables and time-series operators not allowed”。求助大虾该怎么办？？急！！多谢！！！
For the panel data, there are two dimensions, one is individual dimension, the other is time dimension. You should tell Stata before you run the regression. You can try my code, it should work for you.
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