Bankacılık ve Finans Bölümü Yayın Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/400
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Article Citation - WoS: 2Citation - Scopus: 2Testing for Unit Roots in Nonlinear Dynamic Heterogeneous Panels With Logistic Smooth Breaks(Mdpi, 2023) Omay, Tolga; Ucar, NuriIn this study, we investigate the validity of the purchasing power parity (PPP) proposition for 34 European and selected global countries. For this purpose, we propose a new unit root test for cross-sectionally dependent heterogeneous panels that allows for gradual structural breaks and symmetric nonlinear adjustment toward the equilibrium level. The alternative hypothesis stationary is obtained by symmetric adjustment due to exponential smooth transition autoregression (ESTAR) around a nonlinear trend. Moreover, we provide small sample properties extensively for the newly proposed test. Hence, this alternative hypothesis has been proven to characterize real exchange rate data (REER) correctly. Thus, the newly proposed tests provide an essential basis for modeling the REER series correctly. Finally, we also derive the approximate asymptotic distribution of the proposed tests using new techniques.Article Fractional Frequency Flexible Fourier Form to approximate smooth breaks in unit root testing(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. •Fractional Frequency Flexible Fourier Form-DF-type of unit root test is proposed.•The small sample properties of FFFFF-DF-type test are better than EL test.•FFFFF-DF-type test improves the empirical testing performance.•FFFFF-DF-type test prevents type two errors and over-filtration problems.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.