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Modelling inflation dynamics: a Bayesian comparison between GARCH and stochastic volatility

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  • Hai Le

Abstract

This study employs a prominent model comparison criterion, namely the Bayes factor, to compare three commonly used GARCH models with their stochastic volatility (SV) counterparts in modelling the dynamics of inflation rates. By using consumer price index (CPI) data from 18 developed countries to evaluate these models, we find that the GARCH models are generally outperformed by their stochastic volatility counterparts. Furthermore, the stochastic volatility in mean (SV-M) model is shown to be the best for all 18 countries considered. The paper also examines which model characteristics play a main role in modelling inflation rates. It turns out that inflation volatility feedback is a crucial feature that we should take into consideration when modelling inflation rates. The relevance of a leverage effect, however, is found to be rather ambiguous. Finally, the forecasting results using the log predictive score confirm these findings.

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  • Hai Le, 2023. "Modelling inflation dynamics: a Bayesian comparison between GARCH and stochastic volatility," Economic Research-Ekonomska Istraživanja, Taylor & Francis Journals, vol. 36(1), pages 2112-2136, March.
    • Handle: RePEc:taf:reroxx:v:36:y:2023:i:1:p:2112-2136
    DOI: 10.1080/1331677X.2022.2096093
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