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Modelling Returns and Volatilities During Financial Crises: a Time Varying Coefficient Approach

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  • Menelaos Karanasos
  • Alexandros Paraskevopoulos
  • Faek Menla Ali
  • Michail Karoglou
  • Stavroula Yfanti
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    Abstract

    We examine how the most prevalent stochastic properties of key financial time series have been affected during the recent financial crises. In particular we focus on changes associated with the remarkable economic events of the last two decades in the mean and volatility dynamics, including the underlying volatility persistence and volatility spillovers structure. Using daily data from several key stock market indices we find that stock market returns exhibit time varying persistence in their corresponding conditional variances. Furthermore, the results of our bivariate GARCH models show the existence of time varying correlations as well as time varying shock and volatility spillovers between the returns of FTSE and DAX, and those of NIKKEI and Hang Seng, which became more prominent during the recent financial crisis. Our theoretical considerations on the time varying model which provides the platform upon which we integrate our multifaceted empirical approaches are also of independent interest. In particular, we provide the general solution for low order time varying specifications, which is a long standing research topic. This enables us to characterize these models by deriving, first, their multistep ahead predictors, second, the first two time varying unconditional moments, and third, their covariance structure.

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    File URL: http://arxiv.org/pdf/1403.7179
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    Bibliographic Info

    Paper provided by arXiv.org in its series Papers with number 1403.7179.

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    Date of creation: Mar 2014
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    Handle: RePEc:arx:papers:1403.7179

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