Ekonomi Bölümü Yayın Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/818
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Conference Object A Case Study: Internet Based Collaborative and Cooperative Learning(int inst informatics & Systemics, 2007) Demirbulak, Dilara; Aşkun, Ali Rıza; Demirbulak, Dilara; Askun, Ali Riza; Ortak Dersler Bölümü; İngiliz Dili ve EdebiyatıThe Internet has improved the quality and quantity of communication all over the world by providing opportunity to electronically deliver and share knowledge instantly all over the world. As for the impact of this on education the ones relevant for this study are the need to integrate educational technology and collaborative learning into curriculum. This is the third phase of a longitudinal study. It was carried out at an English Language Teacher Training Certificate Program, "Methodology" course at a Higher Education institution. The same course was being given by one instructor to two different groups of learners who had not met each other. Each week a different method was focused on by different groups of learners. Each group presented the principles of the method using the method itself and then discussions were carried out. The presentations were video-taped and discussions were carried out based on key points presented via power-point. The learners in the two courses focusing on the same methodology were asked to interact by means of the internet and their output was evaluated, Based on the results of data gathered it could be said that virtual teams learner outputs were, effective and in some cases were more effective than the face to face teams.Book Part Does the Term Structure of Interest Rate Predict Real Economic Activity? Nonlinear Evidence From Turkey(Nova Science Publishers, Inc., 2013) Omay, T.; Omay, Tolga; Hasanov, M.; Çankaya Meslek YüksekokuluIn this chapter we investigate whether the term structure of interest rates contains useful information about future real economic activity in Turkey for the period 1995:1 to 2003:3. The best model to describe the relationship between the term structure of interest rate and real economic activity in Turkey has been found to be Multiple Regime Smooth Transition Regression (MR-STR) model. Our results show that the relationship between the term structure of interest rates and the future economic activity is negative and significant in economic expansion and contraction periods, while it becomes positive and insignificant in moderate growth periods. In order to analyze these relationships, we employ correlation analysis by using nonparametric estimation technique. The results of correlation analysis are found to be consistent with the recursive Chow test and parameter stability tests. In addition, the correlation analysis indicates that the negative effects of the spread on real output can be explained by the interaction between the effects of the Expectation Hypothesis and Interest Transmission Channel. © 2012 by Nova Science Publishers, Inc. All rights reserved.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) Omay, Tolga; Corakci, AysegulThis 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: 1Citation - Scopus: 1A Unit Root Test With Markov Switching Deterministic Components: A Special Emphasis on Nonlinear Optimization Algorithms(Springer, 2024) Corakci, Aysegul; Omay, TolgaIn this study, we investigate the performance of different optimization algorithms in estimating the Markov switching (MS) deterministic components of the traditional ADF test. For this purpose, we consider Broyden, Fletcher, Goldfarb, and Shanno (BFGS), Berndt, Hall, Hall, Hausman (BHHH), Simplex, Genetic, and Expectation-Maximization (EM) algorithms. The simulation studies show that the Simplex method has significant advantages over the other commonly used hill-climbing methods and EM. It gives unbiased estimates of the MS deterministic components of the ADF unit root test and delivers good size and power properties. When Hamilton's (Econometrica 57:357-384, 1989) MS model is re-evaluated in conjunction with the alternative algorithms, we furthermore show that Simplex converges to the global optima in stationary MS models with remarkably high precision and even when convergence criterion is raised, or initial values are altered. These advantages of the Simplex routine in MS models allow us to contribute to the current literature. First, we produce the exact critical values of the generalized ADF unit root test with MS breaks in trends. Second, we derive the asymptotic distribution of this test and provide its invariance feature.Article Citation - WoS: 15Citation - Scopus: 14A Nonparametric Panel Data Model for Examining the Contribution of Tourism To Economic Growth(Elsevier, 2023) Zhang, Xibin; Dogan, ErgunWe apply a nonparametric panel data model with cross-sectional and time-varying coefficients to examine the relationship between tourist arrivals and economic growth in the Schengen area from 1995 to 2019. In contrast to the parametric models employed in other studies, our nonparametric model makes no assumption about functional form and, hence, allows us to model the relationship nonlinearly. We find that the tourism-economic growth relationship in the Schengen area is nonlinear and time-varying. While the relationship between tourism and economic growth was positive and significant during 1995-2003, it was negative and significant during the Global Financial Crisis (2007-2008) and the European recession of 2012-2013. One additional contribution of the study is the finding that total factor productivity (TFP) has been growing at 1.45% per year. The results also show that country-level TFP growth was disrupted during the aforementioned negative economic shocks.Book Türkiye' de namus cinayetlerinin dinamikleri(Nüfus Bilim Derneği, 2005) Kardam, FilizBook Part Türkiye’de Cumhuriyetçi Vatandaşlık: Algılama, Pratikler ve Gerilimler(Yordam Kitap, 2009) Kardam, Filiz; Cengiz, KurtuluşBook Social Capital and Business Development in High-Technology Clusters: An Analysis of Contemporary U.S. Agglomerations(2008) Aydoğan, Neslihan; Chen, Yiu PorArticle DO R&D expenditures matter for labor productivity in oecd countries? An unresolved question(2013) Erdil, Erkan; Cilasun, Seyit Mümin; Eruygur, AyşegülÇalışmanın amacı, 22 OECD ülkesi için 1991 2003 dönemi verilerinikullanarak araştırma geliştirme harcamaları ile işgücü verimliliği arasındakiilişkiyi panel veri yöntemleri kullanarak incelemektir. Bu amaçla, fiziki sermeye, bilgi sermayesi, beşeri sermaye ve emekten oluşan bir Cobb-Douglas tipi üretimfonksiyonu tahmin edilmiştir. Bu değişkenlere ilave olarak dış ticaret hacmi veARGE yayılımı kontrol değişkenlerinin eklendiği tahmin sonuçlarına göreişgücü verimliliği ile ARGE arasında pozitif bir uzun dönem esnekliği vardır. Busonuç, işgücü ve sermaye yoğunluğu değişkenlerinin dışarıda bırakıldığıalternatif bir model için de geçerlidir. Dışa açıklığı yansıtan dış ticaret hacmideğişkeni de bu modelde istatistiksel olarak anlamlı bulunmuştur.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) Corakci, Aysegul; Hasdemir, Esra; Omay, TolgaIn 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.