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- W4386841453 abstract "There has been an enormous interest in analysing and modelling periodic time series. The research on periodically integrated autoregressive (PIAR) models which capture the periodic structure and the presence of unit roots is widely applied in environmental, financial and energy areas. In this paper, we propose a multi-companion method which uses the eigen information of the multi-companion matrix in the multi-companion representation of PIAR models. The method enables the estimation and forecasting of PIAR models with a single, two and multiple unit roots. We show that the parameters of PIAR models can be represented in terms of the eigen information of the multi-companion matrix. Consequently, the estimation can be conducted using the eigen information, rather than directly estimating the parameters of PIAR models. A Monte Carlo experiment and an application are provided to illustrate the robustness and effectiveness of the multi-companion method." @default.
- W4386841453 created "2023-09-19" @default.
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- W4386841453 date "2023-09-15" @default.
- W4386841453 modified "2023-09-27" @default.
- W4386841453 title "A Multi-Companion Method to Periodically Integrated Autoregressive Models" @default.
- W4386841453 doi "https://doi.org/10.48550/arxiv.2309.08335" @default.
- W4386841453 hasPublicationYear "2023" @default.
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