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arXiv math/0702769math.STstat.TH
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非平稳回归模型的预测误差

On prediction errors in regression models with nonstationary regressors

Ching-Kang Ing, Chor-Yiu Sin

摘要:

本文给出了非平稳回归模型中最小二乘预报器的最终预报误差和累积预报误差的渐近表达式。证明了FPE中的$1/n$阶项和APE中的$\log n$阶项具有相同的常数,其中$n$是样本量.由于该模型包含了随机游动模型作为特殊情况,这些渐近表达式推广了Wei(1987)和Ing(2001)中的一些结果。此外,我们还表明,虽然FPE的最小二乘预测是不受当代的相关性之间的创新输入和输出变量,最小二乘估计的均方误差不与此相关性。

英文摘要:

In this article asymptotic expressions for the final prediction error (FPE) and the accumulated prediction error (APE) of the least squares predictor are obtained in regression models with nonstationary regressors. It is shown that the term of order $1/n$ in FPE and the term of order $\log n$ in APE share the same constant, where $n$ is the sample size. Since the model includes the random walk model as a special case, these asymptotic expressions extend some of the results in Wei (1987) and Ing (2001). In addition, we also show that while the FPE of the least squares predictor is not affected by the contemporary correlation between the innovations in input and output variables, the mean squared error of the least squares estimate does vary with this correlation.

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