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How Fast Does the Clock of Finance Run?—A Time-Definition Enforcing Stationarity and Quantifying Overnight Duration

Author

Listed:
  • Michele Caraglio

    (Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 21A, A-6020 Innsbruck, Austria)

  • Fulvio Baldovin

    (Dipartimento di Fisica e Astronomia and Sezione INFN, Università di Padova, Via Marzolo 8, I-35131 Padova, Italy)

  • Attilio L. Stella

    (Dipartimento di Fisica e Astronomia and Sezione INFN, Università di Padova, Via Marzolo 8, I-35131 Padova, Italy)

Abstract

A definition of time based on the assumption of scale invariance may enhance and simplify the analysis of historical series with cyclically recurrent patterns and seasonalities. By enforcing simple-scaling and stationarity of the distributions of returns, we identify a successful protocol of time definition in finance, functional from tens of minutes to a few days. Within this time definition, the significant reduction of cyclostationary effects allows analyzing the structure of the stochastic process underlying the series on the basis of statistical sampling sliding along the whole time series. At the same time, the duration of periods in which markets remain inactive is properly quantified by the novel clock, and the corresponding returns (e.g., overnight or weekend) can be consistently taken into account for financial applications. The method is applied to the S&P500 index recorded at a 1 min frequency between September 1985 and June 2013.

Suggested Citation

  • Michele Caraglio & Fulvio Baldovin & Attilio L. Stella, 2021. "How Fast Does the Clock of Finance Run?—A Time-Definition Enforcing Stationarity and Quantifying Overnight Duration," JRFM, MDPI, vol. 14(8), pages 1-15, August.
    • Handle: RePEc:gam:jjrfmx:v:14:y:2021:i:8:p:384-:d:616116
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    References listed on IDEAS

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