Bu çalışmada, işlem hacmi ve İstanbul Menkul Kıymetler Borsası bileşik endeks (İMKB-100) getiri volatilitesi arasındaki ilişki, 1990-2008 dönemleri için GARCH, EGARCH ve TGARCH modellerine işlem hacmi ve haftanın günleri etkileri ilave edilerek araştırılmaktadır. Bulgular, getiri volatilitesinde haftanın günleri ve kaldıraç etkisinin var olduğuna işaret etmektedir. GARCH ve TGARCH modellerin tahmin sonuçları, işlem hacminin getiri volatilitesi üzerindeki etkisinin anlamlı olduğunu fakat pozitif olmadığını göstermektedir. Bu bulgular, İMKB'de "Ardışık Bilgi Akışı" ve "Karışık Dağılımlar" hipotezlerinin geçerliliğine aykırı kanıtlar sağlamaktadır.
This paper investigates the empirical evidence on the link between foreign direct investment and trade (export and import) in Turkey over the period from 1992:01 to 2008:04 by using the minimum LM unit root test for stationarity; Granger and Dolado-Lüthkepohl tests for causality. The test results based on the bi-variate VAR model indicate that there is no evidence of causality between foreign direct investment and trade in Turkey.
This paper examines the external debt sustainability in Turkey over the period 1970-2010 by using fractionally integrated approach. As a first step, possible structural breaks in the data are not taken into consideration. The findings from Robinson(1994a) test reveal that the process is non-stationary with long memory, therefore, there is no evidence of external debt sustainability in Turkey. In the second step, structural breaks identified by Perron (1998, 2003)
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