Modelling and Forecasting COVID-19 Stock Returns using Asymmetric GARCH-ICAPM with Mixture and Heavy-Tailed Distributions

49 Pages Posted: 29 Mar 2021 Last revised: 29 Oct 2022

See all articles by Rewat Khanthaporn

Rewat Khanthaporn

Auckland University of Technology

Nuttanan Wichitaksorn

Auckland University of Technology

Date Written: March 29, 2021

Abstract

COVID-19 pandemic is an extreme event that created a turmoil in stock markets around the world. This unexpected circumstance poses a critical question whether the prevailing models can help predict the plummets of indices, hence the returns. In this study, we model the stock returns using univariate classical and asymmetric generalized autoregressive conditional heteroskedastic (GARCH) with the innovation following (1) mixture of generalized Pareto and Gaussian distributions and (2) generalized error distribution.We also employ the parallel griddy Gibbs (GG) sampling, which is a Markov chain Monte Carlo method, to facilitate the parameter estimation. Our simulation study shows that the GG estimation method outperforms the benchmark quasi-maximum likelihood estimation method. We then proceed to the empirical study of seven stock markets where the results from the in-sample period before the COVID-19 pandemic justify the use of the proposed GARCH models. The out-of-sample forecasts during the early COVID-19 period also show satisfactory results.

Keywords: COVID-19 pandemic, asymmetric GARCH, ICAPM, mixture distribution, generalized Pareto distribution, Markov chain Monte Carlo

JEL Classification: C11, C22, C53, C58, G12

Suggested Citation

Khanthaporn, Rewat and Wichitaksorn, Nuttanan, Modelling and Forecasting COVID-19 Stock Returns using Asymmetric GARCH-ICAPM with Mixture and Heavy-Tailed Distributions (March 29, 2021). Available at SSRN: https://ssrn.com/abstract=3814533 or http://dx.doi.org/10.2139/ssrn.3814533

Rewat Khanthaporn

Auckland University of Technology ( email )

AUT City Campus
Private Bag 92006
Auckland, 1142
New Zealand
+64 121 9977 (Phone)

Nuttanan Wichitaksorn (Contact Author)

Auckland University of Technology ( email )

AUT City Campus
Private Bag 92006
Auckland, 1142
New Zealand

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