Bankacılık ve Finans Bölümü Yayın Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/400
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Article The effects of terrorist activities on foreign direct investment: nonlinear Evidence(2013) Omay, Tolga; Takay Araz, Bahar; Ilalan, DenizIn this study, we examine the relationship between foreign direct investment and terrorist incidents that took place in Turkey for the period from 1991:12 to 2003:12. This research contributes to the literature by checking for a possible non-linear relationship between terrorism and foreign direct investment. The data used to measure the intensity of terrorism were collected from the newspapers of Turkey, and therefore are limited to the direct signals given to the market. Empirical evidence from both linear and non-linear models confirms that terrorism has a large significant negative impact on foreign direct investment. With respect to the nonlinear model, the impact of terrorism on the foreign direct investment is more severe during periods of high terrorism when the intensity of terrorism passes the threshold level 3.725.Article An Examination Of The Effects Of The February, 2001 Crisis (Turkey) On The Performances Of The Low-Q And High-Q Firms(2006) Karadağlı, Ece C.; Omay, TolgaThis paper examines the effects of the February 2001 Economic Crisis (Turkey) on the low-Q and high-Q firms. In the study, our sample is composed of the firms that are actively being traded on Istanbul Stock Exchange (ISE) during that time, and is divided into two sub-samples based on their Tobins' Q values. As firms with high Tobins' Q values are supposed to have lower debt levels we proposed them to be less affected by the crises: their debt repayment commitments are lower, although they are expected to be under the burden of higher interest rates. On the other hand, low-Q firms have incentives to overinvest due to the high levels of available free cash and they may be under the burden of some perquisites expenses. But because of the asset substitution affect, the investments undertaken by low-Q firms are expected to be safer projects while high-Q firms may have undertaken more risky projects. To test our hypothesis that the crisis would affect the low-and high-Q firms to differing extends, we construct the average mean excess returns of both sub-samples and use the Large Sample Test of Hypothesis About a Population Mean method. Our results mainly confirm our expectations: we found that the average mean excess negative returns of high-Q firms were higher than that of low-Q firms during the February 2001 Crisis, indicating that high-Q firms are more riskier in an economic crisis setting than low-Q firms, which in turn implies that the effects of the conflict between equityholders and debtholders dominate the affects of the conflict between managers and the shareholders.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.