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A Random Matrix Approach to VARMA Processes

Author

Listed:
  • Zdzis{l}aw Burda
  • Andrzej Jarosz
  • Maciej A. Nowak
  • Ma{l}gorzata Snarska

Abstract

We apply random matrix theory to derive spectral density of large sample covariance matrices generated by multivariate VMA(q), VAR(q) and VARMA(q1,q2) processes. In particular, we consider a limit where the number of random variables N and the number of consecutive time measurements T are large but the ratio N/T is fixed. In this regime the underlying random matrices are asymptotically equivalent to Free Random Variables (FRV). We apply the FRV calculus to calculate the eigenvalue density of the sample covariance for several VARMA-type processes. We explicitly solve the VARMA(1,1) case and demonstrate a perfect agreement between the analytical result and the spectra obtained by Monte Carlo simulations. The proposed method is purely algebraic and can be easily generalized to q1>1 and q2>1.

Suggested Citation

  • Zdzis{l}aw Burda & Andrzej Jarosz & Maciej A. Nowak & Ma{l}gorzata Snarska, 2010. "A Random Matrix Approach to VARMA Processes," Papers 1002.0934, arXiv.org.
  • Handle: RePEc:arx:papers:1002.0934
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    File URL: http://arxiv.org/pdf/1002.0934
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    Cited by:

    1. Joongyeub Yeo & George Papanicolaou, 2016. "Random matrix approach to estimation of high-dimensional factor models," Papers 1611.05571, arXiv.org, revised Nov 2017.

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