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工具变量（IV）
工具变量（IV）
相关性与外生性、2SLS、弱工具变量、LATE解读
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Causal Inference Foundations
Why causal questions need special designs
Difference-in-Differences (DID)
From classic 2×2 to staggered adoption
Panel Data
Fixed effects and beyond
Econometrics Mini-Course: Foundations
OLS intuition, variable handling, endogeneity, discrete & truncated models
