Title: Modelling and forecasting long memory time series with exponential and switching GARCH models
Authors: Esmail Amiri
Addresses: Faculty of Basic Science, Department of Statistics, Imam Khomeini International University, Qazvin, 3414916818, Iran
Abstract: There is some evidence that structural change or stochastic regime switching and long memory are intimately related concepts. However, long memory and regime switching in a stochastic process are properties that could be easily confused in a financial study. Using a modelling approach, the aim is to distinguish regime switching behaviour from long memory for the financial time series. In an empirical study the forecasting performance of symmetric, asymmetric, long memory and Markov switching GARCH model are compared using Tehran stock market daily returns. The results indicate that in out of sample performance, long memory exponential GARCH (FIEGARCH) model outperforms the competing models. To ensure the validity of the results, the value at risk (VaR) forecasts are obtained for each model and a loss function is calculated. A simple rule for distinguishing between long memory and structural break in financial and economic time series is suggested.
Keywords: long memory; Markov switching; GARCH; FIEGARCH; MS-GARCH; structural breaks; ARCH effect; volatility; value at risk; persistence.
International Journal of Monetary Economics and Finance, 2019 Vol.12 No.5, pp.407 - 425
Received: 09 Sep 2018
Accepted: 20 Jun 2019
Published online: 03 Oct 2019 *