Omay, Tolga
Loading...
Profile URL
Name Variants
T.,Omay
Omay, Tolga
O., Tolga
Tolga, Omay
Omay,T.
O.,Tolga
T., Omay
Omay T.
Omay, Tolga
O., Tolga
Tolga, Omay
Omay,T.
O.,Tolga
T., Omay
Omay T.
Job Title
Profesor Doktor
Email Address
tolga.omay@atilim.edu.tr
Main Affiliation
Economics
Status
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
2
ZERO HUNGER
0
Research Products
14
LIFE BELOW WATER
2
Research Products
17
PARTNERSHIPS FOR THE GOALS
7
Research Products
5
GENDER EQUALITY
0
Research Products
16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
8
DECENT WORK AND ECONOMIC GROWTH
11
Research Products
4
QUALITY EDUCATION
0
Research Products
6
CLEAN WATER AND SANITATION
0
Research Products
7
AFFORDABLE AND CLEAN ENERGY
3
Research Products
10
REDUCED INEQUALITIES
2
Research Products
11
SUSTAINABLE CITIES AND COMMUNITIES
1
Research Products
9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
3
Research Products
1
NO POVERTY
0
Research Products
3
GOOD HEALTH AND WELL-BEING
2
Research Products
12
RESPONSIBLE CONSUMPTION AND PRODUCTION
1
Research Products
13
CLIMATE ACTION
7
Research Products
15
LIFE ON LAND
1
Research Products
Documents
80
Citations
1218
h-index
20
Documents
74
Citations
1075
Scholarly Output
65
Articles
55
Views / Downloads
19/0
Supervised MSc Theses
4
Supervised PhD Theses
2
WoS Citation Count
435
Scopus Citation Count
503
WoS h-index
13
Scopus h-index
13
Patents
0
Projects
0
WoS Citations per Publication
6.69
Scopus Citations per Publication
7.74
Open Access Source
32
Supervised Theses
6
Google Analytics Visitor Traffic
| Journal | Count |
|---|---|
| Applied Economics | 5 |
| Computational Economics | 5 |
| Springer Proceedings in Business and Economics -- 4th International Conference on Banking and Fice Perspectives, ICBFP 2019 -- 2 May 2019 through 3 May 2019 -- Famagusta -- 273729 | 3 |
| Mathematics | 3 |
| Environmental Science and Pollution Research | 2 |
Current Page: 1 / 8
Scopus Quartile Distribution
Competency Cloud
43 results
Scholarly Output Search Results
Now showing 1 - 10 of 43
Article Citation - WoS: 6Citation - Scopus: 4Is real per capita state personal income stationary? New nonlinear, asymmetric panel-data evidence(Wiley, 2020) Emirmahmutoglu, Furkan; Gupta, Rangan; Miller, Stephen M.; Omay, TolgaThis paper re-examines the stochastic properties of U.S. state real per capita personal income, using new panel unit-root procedures. The new developments incorporate non-linearity, asymmetry, and cross-sectional correlation within panel-data estimation. Including nonlinearity and asymmetry finds that 43 states exhibit stationary real per capita personal income whereas including only nonlinearity produces 42 states that exhibit stationarity. Stated differently, we find that two states exhibit nonstationary real per capita personal income when considering nonlinearity, asymmetry, and cross-sectional dependence.Article Citation - WoS: 11Testing the Hysteresis Effect in the Us State-Level Unemployment Series(Routledge Journals, Taylor & Francis Ltd, 2020) Omay, Tolga; Ozcan, Burcu; Shahbaz, MuhammedThis paper re-examines the stochastic time series behaviour of the monthly unemployment rate in 50 states of the United States (US) for the period 1976-2017 using a number of state-of-the-art unit root tests. The new developments incorporate structural break, nonlinearity, asymmetry, and cross-sectional correlation within panel-data estimation including the use of a sequential panel selection method. While not previously considered, sequential panel selection enabled us to determine and separate the stationary and nonstationary series in the sample. The empirical findings are in support of the stationarity of unemployment rate in 47 states. The findings confirm a natural rate hypothesis for the labour markets in the most US states, indicating that labour market shocks have solely temporary effects on state-level unemployment. This empirical study provides significant state-specific policy implications.Article Hisse Senedi Getirileri, Bitcoin Getirileri ve Riskten Kaçınma Arasındaki İlişki: Çok Değişkenli Bir Garch Modelinden Kanıtlar(Sosyoekonomi Soc, 2021) Sivrikaya, Ayşen; İren, Perihan; Omay, TolgaBu çalışma, çok değişkenli bir GARCH modeli kullanarak ABD Dow Jones Borsasında işlem gören hisse senedi getirileri, Bitcoin getirileri ve bunların belirsizlikleri arasındaki ilişkileri araştırmaktadır. Özellikle, yüksek ve düşük olmak üzere farklı risk iştahının ve getirilerde belirsizliğin yüksek olduğu dönemlerde Bitcoin ve ABD hisse senedi getirilerinin verdiği tepkileri karşılaştırmaktadır. Sonuçlar, Bitcoin getirisinin riskten kaçınılan veya yüksek belirsizliğin olduğu dönemlerde hisse senedi gibi tepki verdiğini, ancak iki getiri arasındaki ilişkinin sürdürülebilir olmadığını göstermektedir. Öte yandan, ABD borsa yatırımcıları tüm örneklem dönemi boyunca riskten kaçınma davranışını gösterirken, Bitcoin yatırımcıları aynı davranışı göstermemektedir.Article Citation - WoS: 31Citation - Scopus: 35Fractional Unit-Root Tests Allowing for a Fractional Frequency Flexible Fourier Form Trend: Predictability of Covid-19(Springer, 2021) Omay, Tolga; Baleanu, DumitruIn this study we propose a fractional frequency flexible Fourier form fractionally integrated ADF unit-root test, which combines the fractional integration and nonlinear trend as a form of the Fourier function. We provide the asymptotics of the newly proposed test and investigate its small-sample properties. Moreover, we show the best estimators for both fractional frequency and fractional difference operator for our newly proposed test. Finally, an empirical study demonstrates that not considering the structural break and fractional integration simultaneously in the testing process may lead to misleading results about the stochastic behavior of the Covid-19 pandemic.Article Citation - WoS: 10Citation - Scopus: 11Is There Convergence in Renewable Energy Deployment? Evidence From a New Panel Unit Root Test With Smooth and Sharp Structural Breaks(Pergamon-elsevier Science Ltd, 2023) Corakci, Aysegul; Omay, TolgaThis study examines whether the contribution of renewable energy to the total primary energy supply converges in a panel of 24 OECD countries over the period 1960-2020. To this end, a new panel unit root test that allows for both sharp and smooth breaks is proposed to test for the stochastic convergence hypothesis. Although renewable energy convergence is not rejected when the newly proposed test is applied to the full panel of OECD countries, it found only moderate support within the members of the panel using a sequential panel selection methodology. In fact, in two high-income OECD countries, the contribution of renewable energy to the primary energy supply shows no sign of convergence: Poland and Iceland. Therefore, the renewable energy shares seem to be converging to a common steady state in only a group of OECD countries over the long run. This uneven pattern of convergence, in turn, suggests that the OECD countries are still far away from developing a common sustainable renewable energy target, calling for urgent international policy cooperation to encourage the divergent econo-mies to seek out the menu of policies that ensure the worldwide success of renewable energy transformation.Article Citation - WoS: 9Citation - Scopus: 11Current Account and Credit Growth: the Role of Household Credit and Financial Depth(Elsevier Science inc, 2020) Ekinci, Mehmet Fatih; Ekinci, Mehmet Fatih; Omay, Tolga; Omay, Tolga; Ekinci, Mehmet Fatih; Omay, Tolga; Economics; EconomicsUnderstanding the impact of financial variables on the current account balance is one of the priorities of academic literature and policymakers. Evidence from a broad panel of advanced and emerging countries shows that an increase in credit growth is associated with a significant deterioration in the current account balance. When we examine the roles of the components of credit, we find that an increase in household credit causes a significant decline in the current account balance, whereas an increase in business loans has no significant effect. Therefore, our findings indicate that the significant negative impact of credit growth on the current account balance is driven by household credit. Furthermore, we show that total and household credit growth rates have a stronger negative effect on the current account balance for lower levels of financial depth. Our results suggest that targeted policy measures that curb household credit growth might be more effective to reduce external imbalances particularly at the early stages of financial deepening.Article Citation - WoS: 1Citation - Scopus: 2Controlling Heterogeneous Structure of Smooth Breaks in Panel Unit Root and Cointegration Testing(Springer, 2023) Omay, Tolga; Iren, PerihanThis study aims to show the consequences of a restrictive homogeneity assumption of frequency in heterogeneous panel unit root and cointegration testing with Flexible Fourier Form. For this purpose, we use a simple panel unit root and residual based cointegration test with Flexible Fourier Form in a heterogeneous frequency setting using a bootstrap algorithm. The power of the test statistics and empirical analysis results indicate that failing to take into account a heterogeneous frequency may lead to misleading inferences, thereby leading to misspecified tests and erroneous conclusions concerning the stochastic behavior of the data in the panel sample.Article Citation - WoS: 7Citation - Scopus: 6Oil and Stock Prices: New Evidence From a Time Varying Homogenous Panel Smooth Transitionvecmfor Seven Developing Countries(Wiley, 2022) Ceylan, Resat; Ivrendi, Mehmet; Shahbaz, Muhammed; Omay, TolgaThis paper investigates the relationship between international oil price and stock prices applying the time varying causality testing over the period of 2000(M1)-2017(M3). The panel unit root and panel cointegration tests considering cross-section dependence are also employed. A time varying panel smooth transition vector error correction (TV-PSTRVEC) model is a developed and estimated for testing the presence of non-linear short-run and long-run causality, and cointegrating relationship between stock and oil prices. The empirical findings indicate that short and long-run causalities between oil price and stock prices are time-dependent. Moreover, oil price cause stock prices in the long-run. In the short-run, neutral effect exists between oil price and stock prices. These two findings are evidence of a strong exogeneity of oil price in time-dependent regimes which is also supporting the recent arguments and empirical findings.Article Citation - WoS: 5Citation - Scopus: 6High Persistence and Nonlinear Behavior in Financial Variables: a More Powerful Unit Root Testing in the Estar Framework(Mdpi, 2021) Omay, Tolga; Corakci, Aysegul; Hasdemir, EsraIn this study, we consider the hybrid nonlinear features of the Exponential Smooth Transition Autoregressive-Fractional Fourier Function (ESTAR-FFF) form unit root test. As is well known, when developing a unit root test for the ESTAR model, linearization is performed by the Taylor approximation, and thereby the nuisance parameter problem is eliminated. Although this linearization process leads to a certain amount of information loss in the unit root testing equation, it also causes the resulting test to be more accessible and consistent. The method that we propose here contributes to the literature in three important ways. First, it reduces the information loss that arises due to the Taylor expansion. Second, the research to date has tended to misinterpret the Fourier function used with the Kapetanios, Shin and Snell (2003) (KSS) unit root test and considers it to capture multiple smooth transition structural breaks. The simulation studies that we carry out in this study clearly show that the Fourier function only restores the Taylor residuals of the ESTAR type function rather than accounting forthe smooth structural break. Third, the new nonlinear unit root test developed in this paper has very strong power in the highly persistent near unit root environment that the financial data exhibit. The application of the Kapetanios Shin Snell- Fractional Fourier (KSS-FF) test to ex-post real interest rates data of 11 OECD countries for country-specific sample periods shows that the new test catches nonlinear stationarity in many more countries than the KSS test itself.Article Psikolojik Sermaye, Bireysel Performans ve Birey-örgüt Uyumu: Bir Literatür Taraması(2019) Özkan, Osman Seray; Omay, Tolga; Akyüz, Göknur ArzuKüreselleşen dünya ekonomisi ile birlikte ortaya çıkan rekabet şartlarında, örgütlerin varlıklarını sürdürmelerine ve başarılarınıdevam ettirmelerine katkı sağlayan psikolojik sermaye, bireysel performans ve birey-örgüt uyumunun, farklı sektörlerde farklıdeğişkenler ile yapılan araştırmalarda olumlu iş çıktılarına, tutumlarına ve davranışlarına yol açtığı tespit edilmiştir. Bu öneminerağmen, mevcut yazın içerisinde bu kavramlara ilişkin yayınlanan çalışmaların detaylı bir içerik analizi yapılmamıştır.Bu araştırmanın amacı, örgütsel davranış alanında yer alan psikolojik sermaye, bireysel performans ve birey-örgüt uyumukonusunda gerçekleştirilen çalışmaların literatür taramasının yapılarak incelenmesidir. Bu doğrultuda, ulusal tez merkezi ve ulusaldergiler kapsamında 68 yerli araştırma ile Web of Science kapsamında en çok atıf alan ve en güncel olmak üzere 150 yabancıçalışma tetkik edilmiştir.Tetkik edilen çalışmalar içerik analizi yöntemi ile değerlendirilmiştir. İçerik analizi ile araştırmanın kimliği hakkında tanımlayıcıbilgiler; yazar/lar, yıl, dergi, değişkenler, sektör, yöntem ve veri analiz yöntemleri boyutlarını kapsayacak şekilde incelenmiştir. Eldeedilen veriler, yüzde ile frekansa dayalı olarak yorumlanmış ve taksonomik tabloda özetlenmiştir.Araştırma sonuçları; psikolojik sermaye, bireysel performans ve birey-örgüt uyumu ile en fazla ilişki kurulan değişkenlerin: iştatmini, işten ayrılma niyeti, örgütsel bağlılık, liderlik ve örgütsel vatandaşlık davranışı olduğunu göstermiştir. Sektörel açıdandeğerlendirildiğinde eğitim, hizmet, kamu, turizm ve imalat sektörleri ön plana çıkmıştır. Çalışmaların kavramsal ve kuramsalolarak, tarama ve ölçek uyarlama şeklinde gerçekleştirildiği ve görgül çalışmaların ağırlıklı olduğu gözlenmiştir. Verilerin analizindeçoğunlukla regresyon, korelasyon ve doğrulayıcı faktör analizi kullanılmıştır.Araştırmanın bilimsel alana en büyük katkısı, araştırmacıların mevcut yazının genel bir resmini görerek hangi alanların ihmaledildiğine ve hangi alanlarda çalışmalar yapılabileceğine ilişkin fikir sahibi olmalarına imkân vermesidir. Sunulan kapsamlıtaksonomik tablo ile bu araştırmanın psikolojik sermaye, bireysel performans ve birey-örgüt uyumu konusunda ileride yapılacakçalışmalar için bir rehber niteliğinde olduğu öngörülmektedir.
