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20202
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search.filters.applied.f.publicationcategory: Makale - Ulusal Hakemli Dergi - Kurum Öğretim Elemanı × Konu: Stationarity ×

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  • Küçük Resim
    Yayın
    Estimation of Bitcoin volatility: GARCH implementation
    (Seventh Sense Research Group, 2020-01) Teker, Dilek; Teker, Suat
    As bitcoin has been a topic of high interest for academic and professional life over recent years, a number of literature has examined its price movements, volatility, and predictions. Bitcoin is the first and perhaps the most popular cryptocurrency with a high volatility pattern compared to the other cryptocurrencies. This paper examines the models that explain the volatility of Bitcoin prices. The daily data for the Bitcoin prices are used through a period of July 31, 2017, to April 3, 2019, with a total number of observations of 484. Initially, unit root tests are implemented. Then, the heteroskedasticity problem is tested among variables. Based on the results of the heteroskedasticity test, it is decided to use ARCH models. Then, ARCH, GARCH, TGARCH, and EGARCH results are tested to find out the best fit model that explains the bitcoin price movements.
  • Küçük Resim
    Yayın
    Macroeconomic determinants of cryptocurrency volatility: time series analysis
    (The Brooklyn Research and Publishing Institute, 2020-03) Teker, Dilek; Teker, Suat; Özyeşil, Mustafa
    Cryptocurrency is a recent and popular topic that attracts the interest of investors and fund managers. Beyond the market discipline, researchers question the interaction between cryptocurrencies and macroeconomic variables. This study focuses on how the changes in gold and oil prices affect the daily price movements of various cryptocurrencies. The daily database used in this study includes the prices of the cryptocurrencies such as Bitcoin, Tether, Ethereum, Litecon and EOS for the period of August 1, 2017 and April 3, 2019. Initially, the stationarity of the time series is tested by Ng and Perron (2001) method. The existence of the cointegration relationship among the series is tested by Johansen (1988) technique. The presence of causality relationships among the series is investigated with the Dolado and Lütkepohl (1996) causality test. The empirical results support that there exists a cointegration relationship only in between Tether and gold and oil prices.