Bankacılık ve Finans Bölümü Yayın Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/400
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Article Unit Root Testing in the Presence of Mean Reverting Jumps: Evidence From US T-Bond Yields(Walter de Gruyter GmbH, 2019) Ilalan, Deniz; Ozel, OzgurMean reversion of financial data, especially interest rates is often tested by linear unit root tests. However, there are times where linear unit root test results can be misleading especially when mean reverting jump formations are at stage. Considering this framework, we provide a new unit root testing methodology and compute its asymptotic critical values via Monte Carlo simulation. Moreover, we numerically compare the power of this generalized mean reversion test with the pioneering linear unit root test in the literature namely the Augmented Dickey Fuller (ADF) test. We deduce that our test is a refinement of ADF test with a higher power. Weapply our findings to US 10-year Treasury bond yields. We aim to shed light to the discussion among researchers whether interest rates can sometimes revert to a long-term constant mean or not from an unorthodox point of view.Article Citation - WoS: 2Citation - Scopus: 2An Alternative Mean Reversion Test for Interest Rates(Central Bank Republic Turkey, 2018) Ozel, Ozgur; Ilalan, DenizA number of empirical studies assert that interest rates are governed by unit root processes rejecting any form of reversion to a long term mean by resorting to certain tests, among which the Augmented Dickey Fuller (ADF) is the most widely used one. In this study, we propose an alternative testing methodology that can be applied along with ADF test, in the sense that there are times where it can capture stationarity when the other fails to do so. Moreover, our test has more power than ADF test. As an application to real-data, we consider 10-year US and Turkish T-bond rates. (C) 2017 Central Bank of The Republic of Turkey. Production and hosting by Elsevier B.V.Book Part Citation - WoS: 1Globalization, Firm Performance and Group Affiliation in Emerging Markets: Evidence From Turkey(Asers Publishing, 2013) Akdoğan, Ece Ceylan; Karadagli, Ece Ceylan; Bankacılık ve FinansAlthough the process of globalization deeply affects businesses in all aspects, unfortunately, the firm level effects of globalization are highly unexplored in the literature. This research aims to explore how the overall globalization level of a country as well as her economic, her political and her social globalization levels affect the performance of both the group affiliated and the unaffiliated firms, operating in this business environment by using pooled panel analysis. To search for the potential differences that may prevail between the firm performance effects of globalization on the group affiliated firms and on the unaffiliated firms, it focuses on Turkish listed companies for the period 2002-2009. The findings of the study indicate that while globalization improves the stock returns of both the group affiliated and the unaffiliated firms, it deteriorates the operational income of both groups of firms. The findings also imply that although the effects of economic and political globalization do not seem to differentiate much between the group affiliated and the unaffiliated firms, social globalization may be argued to affect the operating incomes and the firm growth rates of group affiliated and unaffiliated firms differently. Last but not least, the findings suggest that the most influential dimension of globalization in terms of its effects on firm performance for Turkish companies seems to be the economic globalization.Article Citation - WoS: 2Citation - Scopus: 4How Globalization Affects the Operational Efficiency of Emerging Market Firms?: a Comparative Analysis on Turkish Smes(Univ Oviedo, 2018) Akdogan, Ece CeylanThis paper examines the impact of globalization on the operational efficiency of emerging market firms by concentrating on the financial outcomes of a firm's main operations through focusing on operating income and cash conversion cycle as well as on their possible causes in an emerging market, Turkey. The findings indicate that globalization significantly deteriorates the operating income and lengthens the cash conversion cycle of Turkish firms. Besides, globalization is found to increase sales of SMEs and decrease sales of large companies significantly and the impact on operating income of large companies is observed to be stronger. Globalization is also found to lead a softening in Turkish firm's terms of sales and enable Turkish SMEs to benefit from better terms of purchase.Article Citation - WoS: 11Citation - Scopus: 12Energy Consumption and Growth: New Evidence From a Non-Linear Panel and a Sample of Developing Countries(World Scientific Publ Co Pte Ltd, 2015) Apergis, Nicholas; Ozcelebi, Hulya; Omay, TolgaThis paper investigates the relationship between economic growth and energy consumption through non-linear causality tests. Eight developing countries from Europe and Central Asia spanning the period 1993 to 2008 are selected for the purpose of panel empirical analysis. Panel unit root and panel cointegration tests with and without considering cross section dependency (CD) problems are implemented. Next, linear panel cointegration tests are employed and, finally, a two-regime Dynamic Panel Smooth Transition Vector Error Correction (PSTRVEC) model is estimated for testing the presence of non-linear short-and long-run causality. To this end, a new estimator, called the Dynamic Non-linear Pooled Common Correlated Effect Estimator (DNPCCEE) is proposed. The empirical findings indicate that short and long-run causalities are regime-dependent.Article Sector-Level Competition and Export: Evidence From Exporter Dynamics Database(World Scientific Publ Co Pte Ltd, 2019) Hazar, Adalet; Solakoglu, M. Nihat; Tunc, Cengiz; Babuscu, Senol; Nihat Solakoglu, M.We study the effect of sector-level competition on export by utilizing the Exporter Dynamics Database of the World Bank that provides sector-level competition measure along with destination-specific detailed export data. The results of the analysis show a nonlinear effect of sector-level competition on export. While at less competitive sectors, an increase in competition depresses export, at highly competitive sectors, an increase in competition generates a trade-promoting effect on export. The observed nonlinear effect is robust across sectors and countries. Therefore, productivity of peer firms could generate negative effect on a firm's export performance contrary to the usual positive effect of a firm's own productivity.Article Citation - WoS: 16Citation - Scopus: 18An Empirical Examination of the Generalized Fisher Effect Using Cross-Sectional Correlation Robust Tests for Panel Cointegration(Elsevier Science Bv, 2015) Yuksel, Aydin; Omay, Tolga; Yuksel, AsliThis study examines the generalized Fisher hypothesis as applied to common stocks by using the recently proposed second generation panel cointegration tests. Unlike their predecessors, these new tests assume the existence of cross-section dependence in the data. For the sample analyzed, we report that these new tests, but not their predecessors, provide strong support for the existence of cointegration between stock and goods prices. Moreover, further analysis cannot reject the hypothesis that the cointegration relation is linear. Finally, our Fisher coefficient estimates are in the range between 0.68 and 1.27 and give support to the generalized Fisher hypothesis. (C) 2014 Elsevier B.V. All rights reserved.Article Citation - WoS: 96Citation - Scopus: 96Fractional Frequency Flexible Fourier Form To Approximate Smooth Breaks in Unit Root Testing(Elsevier Science Sa, 2015) Omay, TolgaIn this study, a Fractional Frequency Flexible Fourier Form DF-type unit root test is proposed. The small sample properties of the proposed test are found to be better than that of the integer frequency counterpart. (C) 2015 Elsevier B.V. All rights reserved.Article Citation - WoS: 54Citation - Scopus: 59Reexamining the Ppp Hypothesis: a Nonlinear Asymmetric Heterogeneous Panel Unit Root Test(Elsevier, 2014) Omay, Tolga; Emirmahmutoglu, FurkanIn this study, we re-examine the PPP hypothesis in the light of the new developments in the unit root testing literature. The recent theoretical findings have pointed out that the real exchange rate series exhibit asymmetric nonlinear behavior. A unit root test applied to analyze the PPP hypothesis therefore, should also take into account this asymmetry inherent in the real exchange rate. Different unit root tests that consider the presence of these data features have been developed in the time series literature. However, a true attempt to test the PPP hypothesis should take a panel data approach. To this end, we propose a nonlinear heterogeneous panel unit root test where the alternative hypothesis allows for symmetric or asymmetric exponential smooth transition autoregressive nonlinearity and provide its finite sample properties. We apply our test to the real exchange rates of the 15 European Union countries against the US dollar. While the results of the linear and symmetric nonlinear heterogeneous panel unit root tests are against the PPP hypothesis, the asymmetric nonlinear heterogeneous panel test that we propose gives support for the PPP hypothesis as expected. Therefore, the conclusions drawn from the linear panel unit root tests or the nonlinear panel unit root tests that do not take asymmetry into account might be misleading. (C) 2014 Elsevier B.V. All rights reserved.Article Citation - WoS: 22Citation - Scopus: 26An Empirical Analysis of Household Education Expenditures in Turkey(Pergamon-elsevier Science Ltd, 2016) Cilasun, Seyit Mumin; Acar, Elif Oznur; Gunalp, BurakUsing Turkish Household Budget Surveys from 2003, 2007 and 2012, this paper investigates the determinants of household education expenditures within an Engel curve framework. In particular, we estimate Tobit regressions of real educational expenditures by income groups using a number of household characteristics (i.e. rural residence, employment status, age, educational attainment of the household head, household size, share of female students and primary school students in the household, and total number of students in the household) to examine if and to what extent the determinants of educational expenditures differ by income groups; income elasticities of educational spending evolves over time; and children from middle-class and poor families can benefit enough from educational opportunities. The estimated expenditure elasticities have lower values for the top- and the bottom income quartiles while they have larger values for the middle-income quartiles. The results also show that for all income groups the expenditure elasticity of education increases over time, indicating that Turkish households allocates greater share of their budgets to education expenditures. (C) 2016 Elsevier Ltd. All rights reserved.