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This paper proposes a double tree structured AR-GARCH model for the analysis of stock index return series, which extends previous approaches to incorporate (i) an arbitrary number of multivariate thresholds in conditional means and volatilities of stock index returns and (ii) a richer...
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large economies, USA, United Kingdom, Germany, France and Japan. The empirical results show that although the pure NGARCH … model performs well, the estimation for the German stock index could be significantly improved by an extension which follows …
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Existing multivariate GARCH models either impose strong restrictions on the parameters or do not guarantee a well-defined (positive definite) covariance matrix. I discuss all main Multivariate GARCH models and focus on the BEKK model for which it is shown that the covariance and correlation is...
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