Local Projections and VARs Estimate the Same Impulse Responses
局部投影与向量自回归估计相同的脉冲响应AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要以LP和VAR的脉冲响应及结构识别为核心,并讨论时间序列滞后结构,因此归入VAR与局部投影和时间序列。
局部投影与向量自回归估计相同的脉冲响应AI 解读 ↓
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We prove that local projections (LPs) and Vector Autoregressions (VARs) estimate the same impulse responses. This nonparametric result only requires unrestricted lag structures. We discuss several implications: (i) LP and VAR estimators are not conceptually separate procedures; instead, they are simply two dimension reduction techniques with common estimand but different finite‐sample properties. (ii) VAR‐based structural identification—including short‐run, long‐run, or sign restrictions—can equivalently be performed using LPs, and vice versa. (iii) Structural estimation with an instrument (proxy) can be carried out by ordering the instrument first in a recursive VAR, even under noninvertibility. (iv) Linear VARs are as robust to nonlinearities as linear LPs.
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