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: 20Citation - Scopus: 27Sentiment Dynamics and Volatility of International Stock Markets(Springer Heidelberg, 2017) Aydogan, BernaThis study attempts to analyze the effects of investor sentiment on volatility of nine stock markets, and capture the asymmetry in terms of negative and positive news during the period from January, 2004 to June, 2015. Empirical evidence from a sentiment-augmented TGARCH model demonstrates that there is an asymmetric property for all markets. The estimated coefficient of country-specific consumer confidence index used as a proxy for investor sentiment is statistically significant and negative for France and Germany, but statistically significant and positive for Ireland alone. The results provide evidence that in France and Germany, stock market volatility is sensitive to negative shock in investor sentiment, supporting the existence of the leverage effect; in Ireland, however, no such sensitivity exists. The results of this study should be of a particular interest for both domestic and international investors, academic researchers and policymakers in terms of international portfolio diversification. Investors can potentially improve their portfolio performance by considering investor sentiment, while policymakers can take steps to stabilize investor sentiment, thereby reducing stock market volatility and uncertainty.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 The Interaction of Mutual Fund Flows and Stock Returns: Evidence From the Turkish Capital Market(2014) Tunc, Gokce; Aydoğan, Berna; Vardar, GülinGünümüzde büyüklüğü ve popülerliği hızla artan yatırım fonlarının finansal piyasalar üzerindeki etkilerini anlamak yatırımcılar için oldukça önemlidir. Bu çalışma, Türkiye’deki yatırım fonları ile hisse senetleri arasındaki uzun ve kısa dönemli dinamik ilişkiyi incelemektedir. Seriler arasındaki uzun dönemli dinamik ilişki standart eşbütünleşme testleri ile kısa dönemli nedensellik ilişkisi ise Vektör Hata Düzeltme Modeli (VECM) kullanılarak test edilmiştir. Ampirik bulgular, tüm yatırım fonu tipleri ile hisse senedi getirileri arasında uzun dönemli bir ilişki olduğunu ortaya koymaktadır. Vektör Hata Düzeltme Modeli kullanılarak yapılan Granger nedensellik testleri, tüm yatırım fonu tipleri ile hisse senedi getirileri arasında kısa dönemde çift yönlü nedensellik ilişkisi olduğunu göstermektedir.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: 9Citation - Scopus: 12Impact of Stock Market Trading on Currency Market Volatility Spillovers(Elsevier, 2020) Baklaci, Hasan Fehmi; Aydogan, Berna; Yelkenci, TezerThis research aims to detect the volatility linkages among various currencies during operating and non-operating hours of three major stock markets (Tokyo, London and New York) by employing bivariate VAR-BEKK-GARCH model in selected currency pairs. In particular, the aim is to analyze whether the major stock markets have a differential impact on volatility linkages in currency markets. The results indicate that volatility linkages in intraday are far stronger then in daily results. One remarkable result is that rather than major currencies, some minor and exotic currencies play a leading role in volatility transmission during trading hours of major stock markets.Article Citation - Scopus: 22Crude Oil Price Shocks and Stock Returns: Evidences From Turkish Stock Market Under Global Liquidity Conditions(Econjournals, 2015) Aydogan B.; Berk I.The purpose of this study is to investigate the impacts of crude oil price variations on the Turkish stock market returns. We have employed vector autoregression model using daily observations of Brent crude oil prices and Istanbul Stock Exchange National Index returns for the period between January 2, 1990 and November 1, 2011. We have also tested the relationship between oil prices and stock market returns under global liquidity conditions by incorporating a liquidity proxy variable, Chicago Board of Exchange’s S&P 500 market volatility index into the model. Variance decomposition test results suggest little empirical evidence that crude oil price shocks have been rationally evaluated in the Turkish stock market. Rather, it was global liquidity conditions that were found to account for the greatest amount of variation in stock market returns. © 2015, Econjournals. All rights reserved.Article 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 Citation - WoS: 59Citation - Scopus: 70Does Renewable Energy Promote Green Economic Growth in Oecd Countries?(Emerald Group Publishing Ltd, 2020) Taskin, Dilvin; Vardar, Gulin; Okan, BernaPurpose The development of green economy is of academic and policy importance to governments and policymakers worldwide. In the light of the necessity of renewable energy to sustain green economic growth, this study aims to examine the relationship between renewable energy consumption and green economic growth, controlling for the impact of trade openness for Organization for Economic Co-operation and Development countries over the period 1990-2015, within a multivariate panel data framework. Design/methodology/approach To investigate the long-run relationship between variables, panel cointegration tests are performed. Panel Granger causality based on vector error correction models is adopted to understand the short- and long-run dynamics of the data. Furthermore, ordinary least square (OLS), dynamic OLS and fully modified OLS methods are used to confirm the long-run elasticity of green growth for renewable energy consumption and trade openness. Moreover, system generalized method of moment is applied to eliminate serial correlation, heteroscedasticity and endogeneity problems. The authors used the panel Granger causality test developed by Dumitrescu and Hurlin (2012) to infer the directionality of the causal relationship, allowing for both the cross-sectional dependence and heterogeneity. Findings The results suggest that renewable energy consumption and trade openness exert positive effects on green economic growth. The results of long-run estimates of green economic growth reveal that the long-run elasticity of green economic growth for trade openness is much greater than for renewable energy consumption. The estimated results of the Dumitrescu and Hurlin (2012) test reveal bidirectional causality between green economic growth and renewable energy consumption, providing support for the feedback hypothesis. Practical implications This paper provides strong evidence of the contribution of renewable energy consumption on green economy for a wide range of countries. Despite the costs of establishing renewable energy facilities, it is evident that these facilities contribute to the green growth of an economy. Governments and public authorities should promote the consumption of renewable energy and should have a support policy to promote an active renewable energy market. Furthermore, the regulators must constitute an efficient regulatory framework to favor the renewable energy consumption. Social implications Many countries focus on increasing their GDP without taking the environmental impacts of the growth process into account. This paper shows that renewable energy consumption points to the fact that countries can still increase their economic growth with minimal damage to environment. Despite the costs of adopting renewable energy technologies, there is still room for economic growth. Originality/value This paper provides evidence on the contribution of renewable energy consumption on green economic growth for a wide range of countries. The paper focuses on the impact of renewable energy on economic growth by taking environmental degradation into consideration on a wide scale of countries.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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