Aydoğan, Berna
Loading...
Profile URL
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
1NO POVERTY
0
Research Products
2ZERO HUNGER
0
Research Products
3GOOD HEALTH AND WELL-BEING
0
Research Products
4QUALITY EDUCATION
1
Research Products
5GENDER EQUALITY
0
Research Products
6CLEAN WATER AND SANITATION
0
Research Products
7AFFORDABLE AND CLEAN ENERGY
4
Research Products
8DECENT WORK AND ECONOMIC GROWTH
5
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
4
Research Products
10REDUCED INEQUALITIES
6
Research Products
11SUSTAINABLE CITIES AND COMMUNITIES
2
Research Products
12RESPONSIBLE CONSUMPTION AND PRODUCTION
1
Research Products
13CLIMATE ACTION
3
Research Products
14LIFE BELOW WATER
0
Research Products
15LIFE ON LAND
0
Research Products
16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
17PARTNERSHIPS FOR THE GOALS
3
Research Products
Documents
18
Citations
423
h-index
9
Documents
19
Citations
342
Scholarly Output
31
Articles
24
Views / Downloads
69/74
Supervised MSc Theses
4
Supervised PhD Theses
1
WoS Citation Count
491
Scopus Citation Count
599
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: 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 - 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 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: 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: 8Citation - Scopus: 11Investigating the Ecological Footprint and Green Finance: Evidence From Emerging Economies(Emerald Group Publishing Ltd, 2023) Vardar, Gülin; Aydoğan, Berna; Gürel, BeyzaPurposeConsidering the evolving importance of green finance, this study uses climate-related development mitigation finance as a proxy of green finance and investigates the impact of green finance on ecological footprint as an indicator of environmental quality along with the influence of economic growth, renewable energy, greenhouse gas emissions, trade openness and urbanization across 47 developing countries over the period 2000-2018.Design/methodology/approachAfter finding the presence of cross-sectional dependency among variables, the second-generation panel unit root test was employed to detect the order of integration among the variables. Since all the variables were found to be stationary, Westerlund cointegration technique was employed to detect the long-run relationship among the variables. Then, the long-run elasticity among the dependent and independent variables was tested using fully modified ordinary least squares (FMOLS), dynamic ordinary least squares (DOLS) and pooled mean group-autoregressive distributed lag (PMG-ARDL) approaches.FindingsThe empirical findings suggest the presence of long-run relationship among all the variables, namely, ecological footprint, green finance, economic growth, renewable energy consumption, greenhouse gas emissions, trade openness and urbanization for the selected developing countries in the sample. Furthermore, economic growth, greenhouse gas emissions, trade openness and urbanization, all have a positive and significant impact on the ecological footprint, whereas renewable energy consumption and green finance have a significant and negative impact on the ecological footprint, which supports the view that environmental quality is improved with the greater use of renewable energy technologies and allocation of greater amounts of more green finance.Originality/valueThe empirical results of this study offer policymakers and regulators some implications for environmental policy for protecting the countries from ecological issues.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.
- «
- 1 (current)
- 2
- 3
- »