arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.06401math.STstat.TH
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具有时间序列误差的回归模型的最优模型平均

Toward optimal model averaging in regression models with time series errors

Tzu-Chang F. Cheng, Ching-Kang Ing, Shu-Hui Yu

摘要:

考虑一个具有无穷多个参数和时间序列误差的回归模型。我们感兴趣的是选择加权平均广义最小二乘(GLS)估计从一组近似模型。然而,GLS估计,依赖于未知的逆协方差阵的误差,通常是不可行的。因此,我们构造可行的广义最小二乘(FGLS)估计使用的未知逆矩阵的一致估计。基于此逆协方差阵估计和FGLS估计,我们发展了一个可行的自协方差校正的Malows模型平均准则来选择权重,从而提供了真实回归函数的FGLS模型平均估计。证明了当权向量属于一个连续集时,我们的平均估计的广义平方误差损失渐近等价于GLS模型平均估计的最小广义平方误差损失,该连续集包括Hansen(2007)中使用的离散权向量集作为其真子集.

英文摘要:

Consider a regression model with infinitely many parameters and time series errors. We are interested in choosing weights for averaging across generalized least squares (GLS) estimators obtained from a set of approximating models. However, GLS estimators, depending on the unknown inverse covariance matrix of the errors, are usually infeasible. We therefore construct feasible generalized least squares (FGLS) estimators using a consistent estimator of the unknown inverse matrix. Based on this inverse covariance matrix estimator and FGLS estimators, we develop a feasible autocovariance-corrected Mallows model averaging criterion to select weights, thereby providing an FGLS model averaging estimator of the true regression function. We show that the generalized squared error loss of our averaging estimator is asymptotically equivalent to the minimum one among those of GLS model averaging estimators with the weight vectors belonging to a continuous set, which includes the discrete weight set used in Hansen (2007) as its proper subset.

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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