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Browsing by Author "Ozdemir, Huseyin"

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    Altının Riskten Korunma Etkinliği: Farklı Dinamik Portföy Yaklaşımları İle Bankacılık Sektörü İçin Bir Analiz
    (2022) Ozdemir, Huseyin
    Bu çalışmada minimum varyans, minimum korelasyon ve minimum bağlantılılık yaklaşımları ile altın ve altı büyük bankanın (İş Bankası, Garanti Bankası, Akbank, Yapı Kredi Bankası, Halkbank ve Vakıfbank) hisse senedinden oluşan portföyün finansal analizi yapılmıştır. Çalışmanın amacı altının Türkiye’de faaliyet gösteren altı büyük banka hisse senetlerine karşı finansal koruma sağlayıp sağlamadığının araştırılmasıdır. Ayrıca bu çalışmada altının finansal koruma etkinliğinin ölçülmesi de amaçlanmıştır. Analiz edilen veriler günlük frekansta olup gözlem dönemi 01.01.2018- 08.11.2022 arasını içermektedir. Çalışma kapsamında kullanılan portföy oluşturma yaklaşımı TVP-VAR modelinden elde edilmiştir. Ampirik sonuçlar, zamana ve portföy oluşturma yaklaşımına bağlı olarak altının banka hisse senetleri içindeki optimal oranının %39 ile %53 oranında değiştiğini göstermektedir. Oluşturulan portföylerde söz konusu bankaların hisse senedi oynaklıklarının yaklaşık %75 oranında azaldığı gözlemlenmiştir. MCP ve MCoP yaklaşımları ile karşılaştırdığında en yüksek kümülatif getirinin olduğu yaklaşım MVP yaklaşımıdır. Ayrıca, çalışma kapsamında elde edilen bulgular altının ayı piyasasında banka hisse senetleri için iyi bir finansal koruma sağladığını göstermektedir.
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    Citation - WoS: 1
    Hedging Effectiveness of Gold: an Analysis for the Banking Sector With Different Dynamic Portfolio Approaches
    (Economic and Financial Research Assoc - Efad, 2022) Ozdemir, Huseyin
    In this study, we construct portfolios including gold and six major stock exchanges (& Idot;sbank, Garanti Bank, Akbank, Yap & imath; Kredi Bank, Halkbank, Aand Vak & imath;fbank) by using three different dynamic portfolio approaches (i.e., minimum variance, minimum correlation, and minimum connectedness approaches). The aim of the study is to investigate whether gold can be used as a hedge against six major banks operating in Turkey. Further, this study also aims to measure the hedging effectiveness of gold. We adopt a fully time- varying parameter vector auto-regression (TVP-VAR) econometric framework, applied to daily data spanning June 2018 to November 2022. Empirical results show that the optimal ratio of gold in bank stocks varies between 39% and 53%, depending on time and portfolio construction approach. It is observed that the volatility of bank stocks in the portfolios has decreased by approximately 75%. According to the MCP and MCoP approaches, the highest return was obtained from the portfolio constructed with the MVP approach. In addition, the empirical findings show that gold can be used as a hedging instrument against banking stocks in bear market conditions.
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    Citation - WoS: 10
    Citation - Scopus: 9
    On the Risk Spillover From Bitcoin To Altcoins: the Fear of Missing Out and Pump-And Scheme Effects
    (Mdpi, 2023) Balcilar, Mehmet; Ozdemir, Huseyin
    This article examines the asymmetric volatility spillover effects between Bitcoin and alternative coin markets at the disaggregate level. We apply a frequency connectedness approach to the daily data of 11 major cryptocurrencies for the period from 1 September 2017 to 2 March 2022. We try to uncover the existence of the "fear of missing out" psychological effect and "pump-and-dump schemes" in the crypto markets. To do that, we estimate the volatility spillovers from Bitcoin to altcoin and the cryptos' own risk spillovers during bull and bear markets. The spillover results from Bitcoin to altcoin provide mixed results regarding the presence of this theory for major cryptocurrencies. However, the empirical findings carried out by the cryptos' own spillover effects fully confirm the existence of a fear-of-missing-out effect and pump-and-dump schemes in all cryptocurrencies except for USDT.
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