High-frequency sampling of multivariate CARMA processes

2015/09/11 by Péter Kevei, Kevei, Peter
Decision Sciences · Economics, Econometrics and Finance · Mathematics · #60G12 #Advanced Statistical Process Monitoring #FOS: Mathematics #Financial Risk and Volatility Modeling #Probability (math.PR) #Statistical Methods and Inference

paper · pdf · doi:10.48550/arxiv.1509.03485

openalex publication_date 2015/09/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

High-frequency sampled multivariate continuous time autoregressive moving average processes are investigated. We obtain asymptotic expansion for the spectral density of the sampled MCARMA process (Y_nΔ)_{n ∈ ℤ} as Δ\downarrow 0, where (Y_t)_{t ∈ ℝ} is an MCARMA process. We show that the properly filtered process is a vector moving average process, and determine the asymptotic moving average representation of it, thus generalizing the results by Brockwell et al. in the univariate case to the multivariate model. The determination of the moving average representation of the filtered process, important for the analysis of high-frequency data, is difficult for any fixed positive Δ. However, the results established here provide a useful and insightful approximation when Δ is very small.

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