My bad, the error message is not quite clear:
I moved the IV code of reghdfe into ivreghdfe, so you need to install and use that package in order to do IV
(technically, there is no "IV" code, as I was just wrapping ivreg2)
要用ivreghdfe命令,不要要用reghdfe命令了
2、把ivreg2、reghdfe、ivreghdfe和ftools命令重新安装一下,然后在执行


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