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arXiv 2007.11306stat.ME
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伪似然估计的两阶段正则化及其在时间序列中的应用

Two-Stage Regularization of Pseudo-Likelihood Estimators with Application to Time Series

Erez Buchweitz, Shlomo Ahal, Oded Papish, Guy Adini

摘要:

从非似然的得分函数导出的估计量在实际和现代应用中得到广泛使用。它们的正则化通常由伪后验估计进行,等效地通过向得分函数添加惩罚。我们认为,这种方法是次优的,并提出了一个两阶段的替代方案,涉及到一个新的得分函数,更好地近似于真正的可能性的正则化的目的估计。如果原始得分函数实际上是可能性,则我们的方法通常识别最大后验估计。我们运用我们的理论拟合普通最小二乘(OLS)下同期外生性,经常出现在时间序列的设置,其中OLS是由从业者选择的估计。

英文摘要:

Estimators derived from score functions that are not the likelihood are in wide use in practical and modern applications. Their regularization is often carried by pseudo-posterior estimation, equivalently by adding penalty to the score function. We argue that this approach is suboptimal, and propose a two-staged alternative involving estimation of a new score function which better approximates the true likelihood for the purpose of regularization. Our approach typically identifies with maximum a-posteriori estimation if the original score function is in fact the likelihood. We apply our theory to fitting ordinary least squares (OLS) under contemporaneous exogeneity, a setting appearing often in time series and in which OLS is the estimator of choice by practitioners.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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