Nickell Meets Stambaugh: A Tale of Two Biases in Panel Predictive Regressions
Nickell 遇上 Stambaugh:面板预测回归中的双重偏差AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究面板预测回归的估计偏差,并应用于金融市场股票收益的可预测性。
Nickell 遇上 Stambaugh:面板预测回归中的双重偏差AI 解读 ↓
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In panel predictive regressions with persistent covariates, coexistence of the Nickell bias and the Stambaugh bias imposes challenges for estimation and hypothesis testing. This paper introduces an innovative estimator, the Double IVX (DIVX), inspired by the IVX technique in time series. DIVX effectively removes this composite Nickell-Stambaugh bias and reinstates standard inferential procedures based on the t-statistic. This new procedure achieves unified inference across a wide range of modes of persistence in panel predictive regressions when the cross-sectional dimension and the time dimension are comparably large. Such desirable properties were unattainable by existing methods, including the popular within-group estimator. Extensive Monte Carlo simulations demonstrate the robustness of DIVX under a variety of settings. We apply DIVX to panel data of financial markets in developed economies to examine the predictability of stock returns.