双重差分法作为一种计量模型,其本身不解决内生性问题,双重差分法解决内生性问题,本质上仍然依赖于干预或政策冲击本身的外生性。 双重差分的形式 标准 did(standard did) 双重差.
Jimmy Kimmel 'did lot of things which would get him cancelled today
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