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Limit theorems for the realised semicovariances of multivariate Brownian semistationary processes

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  • Li, Yuan
  • Pakkanen, Mikko S.
  • Veraart, Almut E.D.

Abstract

In this article, we will introduce the realised semicovariance for Brownian semistationary (BSS) processes, which is obtained from the decomposition of the realised covariance matrix into components based on the signs of the returns and study its in-fill asymptotic properties. More precisely, weak convergence in the space of càdlàg functions endowed with the Skorohod topology for the realised semicovariance of a general Gaussian process with stationary increments is proved first. The proof is based on the Breuer–Major theorem and on a moment bound for sums of products of non-linearly transformed Gaussian vectors. Furthermore, we establish a corresponding stable convergence. Finally, a central limit theorem for the realised semicovariance of multivariate BSS processes is established. These results extend the limit theorems for the realised covariation to a result for non-linear functionals.

Suggested Citation

  • Li, Yuan & Pakkanen, Mikko S. & Veraart, Almut E.D., 2023. "Limit theorems for the realised semicovariances of multivariate Brownian semistationary processes," Stochastic Processes and their Applications, Elsevier, vol. 155(C), pages 202-231.
    • Handle: RePEc:eee:spapps:v:155:y:2023:i:c:p:202-231
    DOI: 10.1016/j.spa.2022.10.001
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    References listed on IDEAS

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