Did Mreasydeck Redgifs Go Too Far This Time? The Debate Rages. You Know That Itsautumnmoonxx Has Over 85m Views On
Did Mreasydeck Redgifs Go Too Far This Time? The Debate Rages. You Know That Itsautumnmoonxx Has Over 85m Views On Overview
随着 did 方法的拓展，许多实证研究将其拓展为多期 did，即实验组并非在同一时点遭受政策冲击。 但是，自 2019 年来，不少学者纷纷指出这种多期 did 有可能会产生有偏估计 (athey and. 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。 标准 did（standard did） 双重差分的核心是通过构造交互项来.
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