Aydoğan, Berna
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Name Variants
Aydogan, Berna
Okan, Berna
Aydoğan B.
Okan, Berna
Aydoğan B.
Job Title
Email Address
berna.okan@ieu.edu.tr
Main Affiliation
03.04. International Trade and Finance
Status
Current Staff
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
5
GENDER EQUALITY
0
Research Products
9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
3
Research Products
13
CLIMATE ACTION
2
Research Products
8
DECENT WORK AND ECONOMIC GROWTH
4
Research Products
14
LIFE BELOW WATER
0
Research Products
17
PARTNERSHIPS FOR THE GOALS
2
Research Products
1
NO POVERTY
0
Research Products
2
ZERO HUNGER
0
Research Products
4
QUALITY EDUCATION
1
Research Products
11
SUSTAINABLE CITIES AND COMMUNITIES
1
Research Products
16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
3
GOOD HEALTH AND WELL-BEING
0
Research Products
6
CLEAN WATER AND SANITATION
0
Research Products
12
RESPONSIBLE CONSUMPTION AND PRODUCTION
0
Research Products
10
REDUCED INEQUALITIES
6
Research Products
15
LIFE ON LAND
0
Research Products
7
AFFORDABLE AND CLEAN ENERGY
2
Research Products
Documents
18
Citations
423
h-index
9
Documents
19
Citations
342
Scholarly Output
31
Articles
24
Views / Downloads
8/424
Supervised MSc Theses
4
Supervised PhD Theses
1
WoS Citation Count
491
Scopus Citation Count
599
WoS h-index
9
Scopus h-index
10
Patents
0
Projects
1
WoS Citations per Publication
15.84
Scopus Citations per Publication
19.32
Open Access Source
8
Supervised Theses
5
| Journal | Count |
|---|---|
| Journal of Economic and Administrative Sciences | 3 |
| Iktısat Isletme Ve Fınans | 2 |
| Euromed Journal of Busıness | 2 |
| Economıc Modellıng | 1 |
| Ege Academıc Revıew | 1 |
Current Page: 1 / 5
Scopus Quartile Distribution
Competency Cloud
29 results
Scholarly Output Search Results
Now showing 1 - 10 of 29
Article Citation - WoS: 7Citation - Scopus: 8The Impact of Firm-Specific Public News on Intraday Market Dynamics: Evidence From the Turkish Stock Market(Routledge Journals, Taylor & Francis Ltd, 2011) Baklaci, Hasan F.; Tunc, Gokce; Aydogan, Berna; Vardar, GulinThis study attempts to discover the intraday firm-specific news announcements and return volatility relation in the Turkish stock market. The GARCH framework is utilized to investigate the impact of firm-specific public news announcements on volatility persistence with and without trading volume. For the majority of the stocks in the sample, the volatility persistence diminishes with the inclusion of firm-specific news, implying that news is impounded rapidly into prices. This effect is more pronounced for larger stocks. When there is no news, the trading volume does not appear to reduce the volatility persistence for the majority of stocks, possibly due to the presence of private information possessed by informed traders.Article Volatility Transmission Between Housing and Stock Markets in Europe: a Multivariate Garch Perspective(Ege Univ, Fac Economics & Admin Sciences, 2018) Vardar, Gulin; Aydogan, BernaOver the past decade, the significant changes in the prices of stock and real estate markets have intensified the interest of heightened concern about volatility in these markets. This paper deals with the dynamic return and volatility transmissions across real estate and stock markets in European countries over the period from 1985:Q1 through 2017:Q1. Using VAR-BEKK-GARCH model, we find significant evidence supporting shock and volatility spillover effects from real estate to stock markets in Denmark, Finland, Ireland and Spain whereas evidence running from stock to real estate markets is found in Spain, Sweden and Italy. In contrast, there is no evidence of any such spillovers in Belgium. Overall, these empirical findings provide fresh insights and policy implications in cross-market volatility spillovers for domestic and international investors, and also policy makers, through the potential for improved risk management and more efficient portfolio diversification.Article Citation - WoS: 20Volatility Spillovers Among G7, E7 Stock Markets and Cryptocurrencies(Emerald Publishing, 2024) Aydoğan, B.; Vardar, G.; Tacoglu, C.Purpose – The existence of long memory and persistent volatility characteristics of cryptocurrencies justifies the investigation of return and volatility/shock spillovers between traditional financial market asset classes and cryptocurrencies. The purpose of this paper is to investigate the dynamic relationship between the cryptocurrencies, namely Bitcoin and Ethereum, and stock market indices of G7 and E7 countries to analyze the return and volatility spillover patterns among these markets by means of multivariate (MGARCH) approach. Design/methodology/approach – Applying the newly developed VAR-GARCH-in mean framework with the BEKK representation, the empirical results reveal that there exists an evidence of mean and volatility spillover effects among Bitcoin and Ethereum as the proxies for the cryptocurrencies, and stock markets reviewed. Findings – Interestingly, the direction of the return and volatility spillover effects is unidirectional in most E7 countries, but bidirectional relationship was found in most G7 countries. This can be explained as the presence of a strong return and volatility interaction among G7 stock markets and crypto market. Originality/value – Overall, the results of this study are of particular interest for portfolio management since it provides insights for financial market participants to make better portfolio allocation decisions. It is also increasingly important to understand the volatility transmission mechanism across these markets to provide policymakers and regulatory bodies with guidance to eliminate the negative impact of cryptocurrency's volatility on the stability of financial markets. © 2021 Emerald Publishing LimitedArticle Citation - WoS: 2Citation - Scopus: 3Volatility Spillovers Effects Between Energy Commodities and Islamic Stock Markets(Penerbit Univ Sains Malaysia, 2024) Bilgin, Mehmet Huseyin; Vardar, Gülin; Aydoğan, Berna; Lau, EvanEmpirical research exploring the relationship between capital markets and energy prices plays a crucial role in shaping policies for the growth of the Islamic financial system. This study aims to investigate potential shock transmission and volatility spillover effects among Islamic stock indices from selected Middle East and Northern Africa countries as well as crude oil prices and natural gas, over the period from August 2007 to September 2020. Applying VAR-BEKK-GARCH representation, the results reveal the evidence of bidirectional cross-market shock and volatility spillover effects between Kuwait and Qatar Islamic stock indexes, crude oil prices, and natural gas. Moreover, the results indicate the existence of bidirectional/unidirectional shock and volatility spillovers between Islamic indexes and all other variables, meaning there are information flows between these variables in all four countries except Turkey. Regarding the results of volatility spillovers, there is no spillover effect between Turkey's MSCI Islamic index and Brent crude oil. These findings bear significant implications for portfolio management, offering valuable insights to financial market participants for making improved portfolioArticle Citation - WoS: 29Citation - Scopus: 41Return and Volatility Spillovers Between Bitcoin and Other Asset Classes in Turkey Evidence From Var-Bekk Approach(Emerald Group Publishing Ltd, 2019) Vardar, Gulin; Aydogan, BernaPurpose With a substantial return and volatility characteristic of Bitcoin, which may be seen as a new category of investment assets, better understanding of the nature of return and volatility spillover can help investors and regulators in achieving the potential goal from portfolio diversification. The paper aims to discuss these issues. Design/methodology/approach This paper explores the return and volatility transmission between the Bitcoin, as the largest cryptocurrency, and other traditional asset classes, namely stock, bond and currencies from the standpoint of Turkey over the period July, 2010-June, 2018 using the newly developed multivariate econometric technique, VAR-GARCH, in mean framework with the BEKK representation. Findings The empirical results reveal the existence of the positive unilateral return spillovers from the bond market to Bitcoin market. Regarding the results of shock and volatility spillovers, there exists strong evidence of bidirectional cross-market shock and volatility spillover effects between Bitcoin and all other financial asset classes, except US Dollar exchange rate. Originality/value The important extention is the adoption of a newly developed multivariate econometric technique, VAR-GARCH, in mean framework with the BEKK representation, proposed by Engle and Kroner (1995), which is employed for the first time specifically to examine the extent of integration in terms of volatility and return between Bitcoin and key asset classes. Second, Bitcoin has experienced a rapid growth since around a decade and a number of investors are showing interest in its potential as an integrative part of portfolio diversification. The information provided by empirical results gives empirical bases from which to address topics concerning hedging purposes and optimal portfolio allocation. It is also increasingly important to analyze the current behavior of Bitcoin in relation to other assets to provide policy makers and regulatory bodies with guidance on the role of the Bitcoin as an investment asset in Turkey. Thus, this is the first serious attempt at exploring the potential for Bitcoin to offer diversification opportunities in the context of Turkey.Article Yatırımcı Duyarlılığının Borsa İstanbul Sektör Endeks Getirileri Üzerine Etkisi(2015) Vardar, Gülin; Aydoğan, BernaÇalışmada 2004 Ocak2014 Ocak dönemine ait aylık veriler kullanılarak Türkiyedeki yatırımcı duyarlılığının Borsa İstanbul sektör endeks getirileri üzerindeki etkileri Yapısal Olmayan Vektör Otoregresyonu (VAR) ve Genelleştirilmiş Etki-Tepki Analizi yöntemleri ile test edilmiştir. Rasyonel yatırımcı duyarlılığında meydana gelen 1 standart sapmalık şok karşısında hiçbir sektör endeks getirisi tepki vermez iken irrasyonel yatırımcı duyarlılığına karşı Ulaştırma ve İletişim sektörleri hariç diğer tüm sektör getirilerinin anlamlı tepkiler vermesi VAR analizinden elde edilen ilişkiyi de destekler niteliktedir.Article Citation - WoS: 1The Competitive Conditions of the Banking Industry in the Post-Crises Period: an Analysis of Turkish Banks(Bilgesel Yayincilik San & Tic Ltd, 2014) Vardar, Gulin; Aydogan, Berna; Seven, UnalAfter the 2000-2001 financial crises, the Turkish banking sector experienced a process of concentration, with the tendency for merger and acquisition activities, the revocation of licenses and the liquidation of some insolvent banks. This paper assesses the competitive structures in the Turkish banking industry over the period 2003-2011 using a rigidly statistical method of Panzar-Rosse (1987), and examines whether the banking system was affected by the structural changes initiated in the post crises period. The results indicate that competition in the banking sector is most accurately characterized by the theoretical model of monopolistic competition for the period under consideration. There is no evidence that the deregulation adopted after the crises resulted in a significant change in the competitive conditions in Turkish banking industry.Article Citation - WoS: 5The the Impact of Gender Differences on Financial Risk Perceptions(Bilgesel Yayincilik San & Tic Ltd, 2010) Tutek, Hulya; Aydogan, Berna; Tunc, Gokce; Vardar, GülinEmpirical studies indicate that women are more risk averse than men. Research on financial risk taking behavior reveal mixed results on gender perception. The aim of this study, which is one of the pioneering papers about behavioral finance in Turkey, is to investigate the differences in risk perceptions of female and male financial advisors in Turkish financial institutions and how they reflect these perception differences on their female and male customers. This research employs questionnaire technique. The findings show that female financial advisors give more importance to the probability of gain or loss from financial investments as well as the reliability of financial information than their male counterparts. The designed hypothetical scenarios point out that female and male financial advisors propose different portfolios for female and male customers having same risk levels.Article Citation - WoS: 93Citation - Scopus: 124Consolidation and Commercial Bank Net Interest Margins: Evidence From the Old and New European Union Members and Candidate Countries(Elsevier Science Bv, 2010) Kasman, Adnan; Tunc, Gokce; Vardar, Gulin; Okan, BernaThis paper examines the effects of financial reforms on the determinants of commercial bank net interest margin in the banking systems of the new EU member countries and candidate countries by dividing the sample period (1995-2006) into two sub-periods: consolidation period (1995-2000) and post-consolidation period (2001-2006). The paper also compares the new and old EU members to check whether differences with respect to the determinants of net interest margins between these two groups of countries exist within the same time period. The results indicate that size and managerial efficiency are negatively and significantly related to net interest margins in the two sub-periods. Regulators should promote merger and acquisition and market entry in order to increase the scale and efficiency of banks operating in the sector. Exploitation of the scale economies seems to be important in decreasing the interest rate spread in the sampled banking sectors. The results further indicate that all macroeconomic variables are statistically insignificant in the second sub-period, suggesting that differences in macroeconomic fundamentals have decreased among the sampled countries due to the increased convergence process in recent years. As for the comparison of the new and old EU members, the results suggest that the financial and economic convergence between the new and old members has not been completed. Macroeconomic differences within the group and between the groups still exist. (C) 2010 Elsevier B.V. All rights reserved.Article Citation - WoS: 13Citation - Scopus: 22Performance Comparison of Islamic (participation) Banks and Commercial Banks in Turkish Banking Sector(Emerald Group Publishing Ltd, 2014) Erol, Cengiz; Baklaci, Hasan F.; Aydogan, Berna; Tunc, GokcePurpose - The purpose of this paper is to attempt to compare the performance of Islamic banks against conventional banks in Turkey. This comparison is much more distinctive and significant in Turkey when compared to other countries, as Turkey stands as a model for the world in interest-free banking system. Design/methodology/approach - The comparative performance analysis was conducted by means of logistic regression method during the period of 2001-2009. The CAMELS approach is utilized to assess the managerial and financial performance of banks. Findings - The results signify that Islamic banks operating in Turkey perform better in profitability and asset management ratios compared to conventional banks but lag in sensitivity to market risk criterion. These findings might mainly be ascribed to the fact that these banks allow lower provisional losses compared to conventional banks and have some tax advantages. Research limitations/implications - Utilizing a more recent and consistent data set, the analyses could be replicated to determine if the results are subject to any sample bias. Practical implications - These finding reveal significant implications for potential entrants into Turkish banking sector particularly for foreign investors. Social implications - The findings from this study may reinforce the awareness and confidence in participating banks in Turkey. Originality/value - Turkey is particularly interesting to conduct this analysis because Turkey is a Muslim but secular country and both Islamic and conventional banks are subject to same set of banking regulations which are based on Western traditional banking system. Furthermore, to the knowledge, there is not a comprehensive study that compares the performance of conventional and Islamic banks in a Western banking system.
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