DOI: https://doi.org/10.14710/medstat.14.1.21-32

SKEW NORMAL AND SKEW STUDENT-T DISTRIBUTIONS ON GARCH(1,1) MODEL

*Didit Budi Nugroho orcid scopus  -  Department of Mathematics and Data Science, Universitas Kristen Satya Wacana, Indonesia
Agus Priyono  -  Department of Mathematics and Data Science, Universitas Kristen Satya Wacana, Indonesia
Bambang Susanto  -  Department of Mathematics and Data Science, Universitas Kristen Satya Wacana, Indonesia
Open Access Copyright (c) 2021 MEDIA STATISTIKA under http://creativecommons.org/licenses/by-nc-sa/4.0.

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Abstract
The Generalized AutoRegressive Conditional Heteroskedasticity (GARCH) type models have become important tools in financial application since their ability to estimate the volatility of financial time series data. In the empirical financial literature, the presence of skewness and heavy-tails have impacts on how well the GARCH-type models able to capture the financial market volatility sufficiently. This study estimates the volatility of financial asset returns based on the GARCH(1,1) model assuming Skew Normal and Skew Student-t distributions for the returns errors. The models are applied to daily returns of FTSE100 and IBEX35 stock indices from January 2000 to December 2017. The model parameters are estimated by using the Generalized Reduced Gradient Non-Linear method in Excel’s Solver and also the Adaptive Random Walk Metropolis method implemented in Matlab. The estimation results from fitting the models to real data demonstrate that Excel’s Solver is a promising way for estimating the parameters of the GARCH(1,1) models with non-Normal distribution, indicated by the accuracy of the estimation of Excel’s Solver. The fitting performance of models is evaluated by using log-likelihood ratio test and it indicates that the GARCH(1,1) model with Skew Student-t distribution provides the best fitting, followed by Student-t, Skew-Normal, and Normal distributions.
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Keywords: Skew Distribution; GARCH; Excel’s Solver; Volatility
Funding: Universitas Kristen Satya Wacana with Contract Number: 436/Penel./Rek./9/V/2019

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Language : EN
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