已解决
麻烦看一下两阶段didi命令是否有错误,为什么回归结果没有控制变量,Accuracy是因变量,$controls是控制变量
. did2s Accuracy , first_stage(i.id i.year $controls ) second_stage(i.Treat_Post $controls) treatment(Treat_Post) cluster(id)
(0 observations deleted)
(Std. err. adjusted for clustering on id)
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| Coefficient Std. err. z P>|z| [95% conf. interval]
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1.Treat_Post | -.1630214 .0758342 -2.15 0.032 -.3116537 -.0143891
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