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Wiener–Kolmogorov Filtering and Smoothing for Multivariate Series With State–Space Structure

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  • Víctor Gómez

Abstract

. Wiener–Kolmogorov filtering and smoothing usually deal with projection problems for stochastic processes that are observed over semi‐infinite and doubly infinite intervals. For multivariate stationary series, there exist closed formulae based on covariance generating functions that were first given independently by N. Wiener and A.N. Kolmogorov around 1940. In this article, we consider multivariate series with a state–space structure and, using a new purely algebraic approach to the problem, we prove the equivalence between Wiener–Kolmogorov filtering and Kalman filtering. Up to now, this equivalence has only been partially shown. In addition, we get some new recursions for smoothing and some new recursions to compute the filter weights and the covariance generating functions of the errors. The results are extended to nonstationary series.

Suggested Citation

  • Víctor Gómez, 2007. "Wiener–Kolmogorov Filtering and Smoothing for Multivariate Series With State–Space Structure," Journal of Time Series Analysis, Wiley Blackwell, vol. 28(3), pages 361-385, May.
    • Handle: RePEc:bla:jtsera:v:28:y:2007:i:3:p:361-385
    DOI: 10.1111/j.1467-9892.2006.00514.x
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