On the modelling and prediction of high-dimensional functional time series

Chang, Jinyuan, Fang, Qin, Qiao, Xinghao ORCID: 0000-0002-6546-6595 and Yao, Qiwei ORCID: 0000-0003-2065-8486 (2024) On the modelling and prediction of high-dimensional functional time series. Journal of the American Statistical Association. ISSN 0162-1459 (In Press)

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Abstract

We propose a two-step procedure to model and predict high-dimensional functional time series, where the number of function-valued time series p is large in relation to the length of time series n. Our first step performs an eigenanalysis of a positive definite matrix, which leads to a one-to-one linear transformation for the original highdimensional functional time series, and the transformed curve series can be segmented into several groups such that any two subseries from any two different groups are uncorrelated both contemporaneously and serially. Consequently in our second step those groups are handled separately without the information loss on the overall linear dynamic structure. The second step is devoted to establishing a finite-dimensional dynamical structure for all the transformed functional time series within each group. Furthermore the finite-dimensional structure is represented by that of a vector time series. Modelling and forecasting for the original high-dimensional functional time series are realized via those for the vector time series in all the groups. We investigate the theoretical properties of our proposed methods, and illustrate the finite-sample performance through both extensive simulation and two real datasets.

Item Type:	Article
Additional Information:	© 2024 The Author(s)
Divisions:	Statistics
Subjects:	H Social Sciences > HA Statistics
Date Deposited:	02 Oct 2024 15:18
Last Modified:	21 Oct 2024 09:36
URI:	http://eprints.lse.ac.uk/id/eprint/125599

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