经济学季刊对双重差分did和工具变量法iv中的表述做出了要求。 一、双差分、事件研究等双向固定效应模型中的平行趋势假设 （1）反事实基础与不可直接检验… 显示全部 关注者 18 被浏览. 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.
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