Regenerating time series from ordinal networks

Michael McCullough, Konstantinos Sakellariou, Thomas Stemler, Michael Small

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)
441 Downloads (Pure)

Abstract

Recently proposed ordinal networks not only afford novel methods of nonlinear time series analysis but also constitute stochastic approximations of the deterministic flow time series from which the network models are constructed. In this paper, we construct ordinal networks from discrete sampled continuous chaotic time series and then regenerate new time series by taking random walks on the ordinal network. We then investigate the extent to which the dynamics of the original time series are encoded in the ordinal networks and retained through the process of regenerating new time series by using several distinct quantitative approaches. First, we use recurrence quantification analysis on traditional recurrence plots and order recurrence plots to compare the temporal structure of the original time series with random walk surrogate time series. Second, we estimate the largest Lyapunov exponent from the original time series and investigate the extent to which this invariant measure can be estimated from the surrogate time series. Finally, estimates of correlation dimension are computed to compare the topological properties of the original and surrogate time series dynamics. Our findings show that ordinal networks constructed from univariate time series data constitute stochastic models which approximate important dynamical properties of the original systems. Published by AIP Publishing.

Original languageEnglish
Article number035814
Number of pages11
JournalChaos
Volume27
Issue number3
DOIs
Publication statusPublished - 1 Mar 2017

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