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Bayesian estimation of a Markov-switching threshold GARCH model with Student-t innovations
Résumé A Bayesian estimation of a regime-switching threshold asymmetric GARCH model is proposed. The specification is based on a Markov-switching model with Student-t innovations and K separate GJR(1,1) processes whose asymmetries are located at free non-positive threshold parameters. The model aims at determining whether or not: (i) structural breaks are present within the volatility dynamics; (ii) asymmetries (leverage effects) are present, and are different between regimes and (iii) the threshold parameters (locations of bad news) are similar between regimes. A novel MCMC scheme is proposed which allows for a fully automatic Bayesian estimation of the model. The presence of two distinct volatility regimes is shown in an empirical application to the Swiss Market Index log-returns. The posterior results indicate no differences with regards to the asymmetries and their thresholds when comparing highly volatile periods with the milder ones. Comparisons with a single-regime specification indicates a better in-sample fit and a better forecasting performance for the Markov-switching model.
   
Mots-clés Asymmetry;Bayesian;GARCH;Markov-switching;SMI;Threshold
   
Citation Ardia, D. (2009). Bayesian estimation of a Markov-switching threshold GARCH model with Student-t innovations. Econometrics Journal, 12(1), 105-126.
   
Type Article de périodique (Anglais)
Date de publication 2009
Nom du périodique Econometrics Journal
Volume 12
Numéro 1
Pages 105-126
URL http://onlinelibrary.wiley.com/doi/10.1111/j.1368-423X.20...
Liée au projet Bayesian estimation of regime-switching GARCH models