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关注这篇论文的作者
Leland E. Farmer

离散化滤波器:非线性状态空间模型的简便估计方法

研究问题
如何以较低计算成本逼近非线性、非高斯状态空间模型的似然,并保留零利率下限等重要非线性特征?
方法与思路
作者提出离散化滤波器近似模型似然,研究对应最大似然估计的渐近性质,并应用于含名义利率零下限的新凯恩斯模型。
材料陈述的贡献
摘要称估计量强一致、渐近正态且有效,低维模拟中同等误差下速度显著提高,应用中菲利普斯曲线斜率估计较低。
阅读关注点
应核对离散化精度随样本量的要求、状态维度对成本的影响、速度比较基准,以及零下限模型的参数识别。
阅读边界
仅据所给 Crossref 摘要,具体正则条件未说明;计算优势明确限于低维模拟,应用结论依赖模型设定,不推断刊本变化。

原文摘要

Existing methods for estimating nonlinear dynamic models are either highly computationally costly or rely on local approximations which often fail adequately to capture the nonlinear features of interest. I develop a new method, the discretization filter, for approximating the likelihood of nonlinear, non‐Gaussian state space models. I establish that the associated maximum likelihood estimator is strongly consistent, asymptotically normal, and asymptotically efficient. Through simulations, I show that the discretization filter is orders of magnitude faster than alternative nonlinear techniques for the same level of approximation error in low‐dimensional settings and I provide practical guidelines for applied researchers. It is my hope that the method's simplicity will make the quantitative study of nonlinear models easier for and more accessible to applied researchers. I apply my approach to estimate a New Keynesian model with a zero lower bound on the nominal interest rate. After accounting for the zero lower bound, I find that the slope of the Phillips Curve is 0.076, which is less than 1/3 of typical estimates from linearized models. This suggests a strong decoupling of inflation from the output gap and larger real effects of unanticipated changes in interest rates in post Great Recession.

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