An autocovariance-based learning framework for high-dimensional functional time series
An autocovariance-based learning framework for high-dimensional functional time series
复制标题
基于自协方差的高维函数时间序列学习框架
DOI:
10.1016/j.jeconom.2023.01.007
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发表时间:
2020-08
影响因子:
6.3
通讯作者:
Qiwei Yao
中科院分区:
文献类型:
--
作者:
Jinyuan Chang;Cheng Chen;Xinghao Qiao;Qiwei Yao
Many scientific and economic applications involve the statistical learning of high-dimensional functional time series, where the number of functional variables is comparable to, or even greater than, the number of serially dependent functional observations. In this paper, we model observed functional time series, which are subject to errors in the sense that each functional datum arises as the sum of two uncorrelated components, one dynamic and one white noise. Motivated from the fact that the autocovariance function of observed functional time series automatically filters out the noise term, we propose a three-step framework by first performing autocovariance-based dimension reduction, then formulating a novel autocovariance-based block regularized minimum distance estimation to produce block sparse estimates, and based on which obtaining the final functional sparse estimates. We investigate theoretical properties of the proposed estimators, and illustrate the proposed estimation procedure with the corresponding convergence analysis via three sparse high-dimensional functional time series models. We demonstrate via both simulated and real datasets that our proposed estimators significantly outperform their competitors.
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影响因子:
6.3
作者:
H. Müller;Rituparna Sen;U. Stadtmüller
通讯作者:
H. Müller;Rituparna Sen;U. Stadtmüller
DOI:
10.1920/wp.cem.2018.3518
发表时间:
2018-06
期刊:
arXiv: Statistics Theory
影响因子:
--
作者:
A. Belloni;V. Chernozhukov;D. Chetverikov;Christian Hansen;Kengo Kato
通讯作者:
A. Belloni;V. Chernozhukov;D. Chetverikov;Christian Hansen;Kengo Kato
DOI:
10.1016/b978-008044910-4.00546-0
发表时间:
2009
期刊:
--
影响因子:
--
作者:
William W. S. Wei
通讯作者:
William W. S. Wei
影响因子:
2
作者:
M. Jirak
通讯作者:
M. Jirak
影响因子:
4.5
作者:
Hall, Peter;Horowitz, Joel L.
通讯作者:
Horowitz, Joel L.