Meslek Yüksek Okulu

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Citation Count: Kılıç, İ.;...et.al. (2023). "Kamu Yararı ve Bir Araç Olarak Hukuk Devleti", Çankaya Üniversitesi Hukuk Fakültesi Dergisi, Vol.8, No.1, pp.163-181.
Kamu Yararı ve Bir Araç Olarak Hukuk Devleti
(2023) Kılıç, İlker; 43431
Citation Count: Hasanov, M., Omay, T. (2008). Nonlinearities in emerging stock markets: evidence from Europe's two largest emerging markets. Applied Economics, 40(20), 2645-2658. http://dx.doi.org/10.1080/00036840600970310
Nonlinearities in emerging stock markets: evidence from Europe's two largest emerging markets
(Routledge Taylor&Francis Group, 2008) Omay, Tolga; Hasanov, Mübariz
Recent developments in time series analysis allow proper modelling of nonlinearities in economic and financial variables. A growing body of research was dedicated to investigation of potential nonlinearities in conditional mean of many economic and financial variables, mainly concentrating in developed economies. However, nonlinearities in financial variables in developing economies have not been fully examined yet. In this article we investigate potential nonlinearity and cyclical behaviour of stock returns in Europe's two largest emerging stock markets, mainly in the Greek and Turkish stock markets. Specifically, we use STAR family models, which allow to model nonlinearities in the conditional mean, for modelling monthly returns on stock exchange indices of the Athens Stock Exchange and Istanbul Stock Exchange. Although we find no nonlinearity in conditional variance, we do find strong evidence in favour of nonlinear adjustment of stock returns. It is found that allowing for nonlinearity in conditional mean results in a superior model and provides good out-of-sample forecasts, which contradicts to efficient market hypothesis
Citation Count: Omay, T. Kan, E.Ö. (2010). Re-examining the threshold effects in the inflation-growth nexus with cross-sectionally dependent non-linear panel: Evidence from six industrialized economies. Economic Modelling, 27(5), 996-1005. http://dx.doi.org/10.1016/j.econmod.2010.04.011
Re-examining the threshold effects in the inflation-growth nexus with cross-sectionally dependent non-linear panel: Evidence from six industrialized economies
(Elsevier Science Bv, 2010) Omay, Tolga; Kan, Elif Öznur
This paper analyzes the empirical relationship between inflation and output growth using a novel panel data estimation technique, Panel Smooth Transition Regression (PSTR) model, which takes account of the non-linearities in the data. By using a panel data set for 6 industrialized countries that enable us to control for unobserved heterogeneity at both country and time levels, we find that there exists a statistically significant negative relationship between inflation and growth for the inflation rates above the critical threshold level of 2.52%, which is endogenously determined. Furthermore, we also control cross-section dependency by using the CD test modified to non-linear context and remedy cross-section dependency with Seemingly Unrelated Regression Equations through Generalized Least Squares (SURE-GLS) and newly proposed Common Correlated Effects (CCE) estimation techniques. We find that these methods change the critical threshold value slightly. The estimated threshold values from these estimation methods are 3.18% and 2.42%, respectively. (C) 2010 Elsevier B.V. All rights reserved
Citation Count: Uçar, N., Omay, T. (2009). Testing for unit root in nonlinear heterogeneous panels. Economics Letters, 104(1), 5-8. http://dx.doi.org/10.1016/j.econlet.2009.03.018
Testing for unit root in nonlinear heterogeneous panels
(Elsevier Science S A, 2009) Uçar, Nuri; Omay, Tolga; 189073
We develop unit root tests for nonlinear heterogeneous panels where the alternative hypothesis is an exponential smooth transition (ESTAR) model, and provide their small sample properties. We apply our tests for investigating the income convergence hypothesis in the OECD sample
Citation Count: Omay, T., Hasanov, M. (2008). The effects of inflation uncertainty on interest rates: a nonlinear approach. Applied Economics, 42(23), 2941-2955. http://dx.doi.org/10.1080/00036840801964757
The effects of inflation uncertainty on interest rates: a nonlinear approach
(Routledge Taylor&Francis Group, 2010) Omay, Tolga; Hasanov, Mübariz
In this article, we investigate the effects of inflation variability on short-term interest rates within a nonlinear smooth transition regression framework. The test results suggest that only the conditional mean of the inflation is a nonlinear process whereas the conditional variance is time variant but linear. Using the square root of conditional variance as a proxy for inflation risk, we estimate Fisher equation augmented with inflation risk. Although the estimated Fisher equations suggest that inflation risk reduces short-term interest rates, we find that the effects of inflation risk on interest rates are regime-dependent. Particularly, we find that the negative effects of inflation variability on nominal rates are greater in low-inflationary regimes when compared to high-inflationary regimes. On the other hand, it is found that both inflation and inflation uncertainty raise the expected inflation effect
Citation Count: Araz-Takay, B., Arın, K.P., Omay, T. (2009). The endogenous and non-linear relationship between terrorism and economic performance: Turkish evidence. Defence And Peace Economics, 20(1), 1-10. http://dx.doi.org/10.1080/10242690701775509
The endogenous and non-linear relationship between terrorism and economic performance: Turkish evidence
(Taylor&Francis INC, 2009) Arın, K. Peren; Omay, Tolga; Araz, Bahar; 177438
This paper investigates the macroeconomic effects of terror by using a novel data set from Turkey for the period of 1987:1 to 2004:4. This research contributes to the literature by controlling for the possible non-linear and endogenous relationship between political conflict and economic activity. Empirical evidence from both linear and non-linear models confirms that terrorism has a large significant negative impact on economic activity. Finally, the results from the non-linear model show that the impact of terrorism on the aggregate economy is more severe during expansionary periods, and that the impact of economic activity on terrorism is significant only in recessionary periods
Citation Count: Omay, T., Hasanov, M. (2011). The relationship between inflation, output growth, and their uncertainties: evidence from selected CEE countries. Emerging Markets Finance And Trade, 47(3), 5-20. http://dx.doi.org/10.2753/REE1540-496X4704S301
The relationship between inflation, output growth, and their uncertainties: evidence from selected CEE countries
(M E Sharpe Inc, 2011) Hasanov, Mübariz; Omay, Tolga
In this paper, we examine causal relationships between inflation rate, output growth rate, inflation uncertainty, and output uncertainty for ten Central and Eastern European transition countries. For this purpose, we estimate a bivariate GARCH model that includes output growth and inflation rates for each country. Then we use conditional standard deviations of inflation and output to proxy nominal and real uncertainty, respectively, and perform Granger causality tests. Our results suggest that inflation rate induces uncertainty about both inflation rate and output growth rate, which is detrimental to real economic activity. At the same time, we find that output growth rate reduces macroeconomic uncertainty in some countries. In addition, we also examine and discuss causal relationships between the remaining variables

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