REGULARIZED ESTIMATION OF DYNAMIC PANEL MODELS
动态面板模型的正则化估计AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究动态面板数据模型、工具变量增多导致的 GMM 偏差及收入动态应用,最直接对应面板数据方向。
动态面板模型的正则化估计AI 解读 ↓
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In a dynamic panel data model, the number of moment conditions increases rapidly with the time dimension, resulting in a large dimensional covariance matrix of the instruments. As a consequence, the generalized method of moments (GMM) estimator exhibits a large bias in small samples, especially when the autoregressive parameter is close to unity. To address this issue, we propose a regularized version of the one-step GMM estimator using three regularization schemes based on three different ways of inverting the covariance matrix of the instruments. Under double asymptotics, we show that our regularized estimators are consistent and asymptotically normal. These regularization schemes involve a tuning or regularization parameter which needs to be chosen. We derive a data-driven selection of this regularization parameter based on an approximation of the higher-order mean square error and show its optimality. As an empirical application, we estimate a model of income dynamics.