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.
Barron Trump's real personality revealed as personal details of 18year
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