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Paper   IPM / P / 14627
School of Physics
  Title:   Coupled uncertainty provided by a multifractal random walker
1.  Z. Koohi Lai
2.  S. Vasheghani Farahani
3.  S.M.S. Movahed
4.  G.R. Jafari
  Status:   Published
  Journal: Phys. Lett. A
  Vol.:  379
  Year:  2015
  Pages:   2284-2290
  Supported by:  IPM
The aim here is to study the concept of pairing multifractality between time series possessing non-Gaussian distributions. The increasing number of rare events creates "criticality". We show how the pairing between two series is affected by rare events, which we call "coupled criticality". A method is proposed for studying the coupled criticality born out of the interaction between two series, using the bivariate multifractal random walk (BiMRW). This method allows studying dependence of the coupled criticality on the criticality of each individual system. This approach is applied to data sets of gold and oil markets, and inflation and unemployment.

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