Abstract
Many real data exhibit periodic behavior. The periodic autoregressive moving average (PARMA) is one of the most common and useful model to describe these data. In the classical case, the PARMA model is considered by the assumption of Gaussian (or finite-variance) distribution of the noise. However, the Gaussian distribution seems to be unsuitable in many real applications, especially when the corresponding data exhibit impulsive-like behavior. Therefore, the extensions of the classical PARMA models are considered and the Gaussian distribution of the noise is replaced by the so-called heavy-tailed distribution. One of the most known distribution that can be used here is the \(\alpha -\) stable one. In this paper, we introduce a new estimation technique for the parameters of the multidimensional periodic autoregressive time series of order 1 (i.e., PAR(1)), which is based on fractional lower-order covariance, the alternative dependence measure adequate for \(\alpha -\)stable distributed models. From theoretical point of view, the use of this technique is justified as in this case the classical measure (i.e., covariance) is not defined. The practical aspect of this technique is discussed. The efficiency of the technique on simulated data is demonstrated using the Monte Carlo approach in different contexts, including the sample size and index of stability \(\alpha \) of the noise’s distribution. Lastly, we present the real data analysis.
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Funding
The work of P. Giri and S. Sundar was supported by Indian Institute of Technology Madras, India, under the Project No. SB20210848MAMHRD008558 ”Centre for Computational Mathematics and Data Science, Department of Mathematics, IIT Madras Chennai India.” The work of A. Wyłomańska was supported by the National Center of Science under Opus Grant 2020/37/B/HS4/00120 ”Market risk model identification and validation using novel statistical, probabilistic, and machine learning tools.”
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[ S.S, A.W, P.G] contributed to conceptualization, [A.W, P.G] contributed to methodology, [ P.G] contributed to formal analysis and investigation, [P.G, A.W] contributed to writing—original draft preparation, [P.G, A.W] contributed to writing—review and editing, and [S.S, A.W] contributed to supervision.
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A Algorithms and additional tables
A Algorithms and additional tables
In this section, we show that how to solve the consistent system of Eq. (38). Since the FLOC-based matrix can be singular or non-singular, i.e., \(\widehat{\mathbf {R_d}}^{v-1}(0)\) may be singular or non-singular for each \(v = 1,\ldots ,T\). The following procedure (algorithm) can be used to solve the system of Eq. (38) in any case.
where BICGSTAB is a procedure (algorithm) for solving linear systems of equations \(\mathbf{A} x = b \) (for example) with preconditioning, where \(\mathbf{A} \) is the coefficient matrix, which may be singular or non-singular, \(\mathbf{x} \) is the unknown vector, and \(\mathbf{b} \) is the known vector. It is the most recent and up-to-date process. For more information on BICGSTAB, see [72,73,74,75].
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Giri, P., Sundar, S. & Wyłomańska, A. Fractional lower-order covariance (FLOC)-based estimation for multidimensional PAR(1) model with \(\alpha -\)stable noise. Int J Adv Eng Sci Appl Math 13, 215–235 (2021). https://doi.org/10.1007/s12572-021-00301-0
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DOI: https://doi.org/10.1007/s12572-021-00301-0