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econ.EM2023
Weak Identification with Many Instruments
Anna Mikusheva, Liyang Sun
Linear instrumental variable regressions are widely used to estimate causal effects. Many instruments arise from the use of ``technical'' instruments and more recently from the emp…
econ.EM2023
Adapting to Misspecification
Timothy B. Armstrong, Patrick Kline, Liyang Sun
Empirical research typically involves a robustness-efficiency tradeoff. A researcher seeking to estimate a scalar parameter can invoke strong assumptions to motivate a restricted e…