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EKONOMİK BİR UYGULAMA İLE KENDİNDEN UYARIMLI EŞİKSEL DEĞİŞEN VARYANSLI OTOREGRESİF MODEL PRACTICE

SELF-EXCITING THRESHOLD AUTOREGRESSIVE MODEL WITH A ECONOMIC

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Abstract (2. Language): 
In this study, structure of a self-exciting threshold autoregressive (SETAR) model which belongs to threshold autoregressive (TAR) model class and choosing its parameters are emphasized. To determine parameters of model, method which was offered by Tsay (1989), was used. Besides mean in different regime, it was considered variance has threshold. A model which was based on daily gold prices which were taken as Turkish lira and in period 03.01.2005-30.12.2011 were applied for numerical example was created.
Abstract (Original Language): 
Bu çalışmada, eşiksel otoregresif (TAR) modeller sınıfından kendinden uyarımlı eşiksel otoregresif (SETAR) modelin yapısı üzerinde durulmuştur. Model parametrelerini belirlemek için Tsay (1989)’in önerdiği yöntem kullanılmıştır. Farklı rejimlerde ortalamanın yanı sıra varyansta da eşiksellik yapısı düşünülerek varyansın modellenmesine çalışılmıştır. Uygulama verisi olarak 03.01.2005-30.12.2011 dönemini kapsayan serbest piyasadaki günlük altın fiyatları serisi TL cinsinden alınarak bir model oluşturulmuştur.
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