Local Projections
综述了局部投影法在估计外生冲击对结果变量影响中的应用，介绍了该方法的最佳实践、扩展及其局限性，适合实证研究者快速掌握这一工具。
A central question in applied research is to estimate the effect of an exogenous intervention or shock on an outcome. The intervention can affect the outcome and controls on impact and over time. Moreover, there can be subsequent feedback between outcomes, controls, and the intervention. Many of these interactions can be untangled using local projections. This method’s simplicity makes it a convenient and versatile tool in the empiricist’s kit, one that is generalizable to complex settings. This article reviews the state of the art for the practitioner and discusses best practices and possible extensions of local projections methods, along with their limitations.