BORSA İSTANBUL’UN ASİMETRİK DİNAMİĞİNİN KANTİL OTOREGRESYON YAKLAŞIMI İLE İNCELENMESİ

Yıl 2023, Cilt: 11 Sayı: 1, 57 - 74, 24.07.2023

Müge Özdemir

https://doi.org/10.18825/iremjournal.1283918

Öz

Bu çalışmada, Borsa İstanbul BİST100 endeksinin asimetrik dinamik sürecini incelemek için normal olmayan süreçler için dirençli çıkarımlar sağlayan kantil otoregresyon yaklaşımına dayalı Koenker-Xiao (2004) kantil birim kök testi ile yeni kanıtlar sunuyoruz. Kantil otoregresyon yaklaşımı, hisse senedi piyasalarını etkileyen farklı büyüklükteki ve işaretteki şokların kalıcılığının ölçülmesine olanak tanır. Bu yaklaşım, endeksin uzun dönem dengesindeki asimetrik dinamiklerin ayarlanmasını yakalayabilir. Bu nedenle, kantil birim kök testleri, en küçük kareler regresyon yöntemine dayanan geleneksel birim kök metodolojilerine kıyasla hisse senedi piyasası dinamiklerine yeni yaklaşımlar katmaktadır. Sonuçlarımız, her frekansta tutarlı olmamakla birlikte, piyasa davranışının sadece ortalamaya dönmediğini, aynı zamanda pozitif ve negatif şoklara farklı bir şekilde asimetrik davranış sergilediğini göstermektedir. Geleneksel birim kök testleriyle karşılaştırıldığında, kantil birim kök testleri Türkiye hisse senedi piyasasının etkin olduğunu desteklemek için daha fazla kanıt sağlar. Ayrıca, şok büyüklüğü ve işaretindeki asimetrik çıkarımlar, hisse senedi piyasalarındaki varlık fiyatlandırması açısından etkinlikten sapmaları tespit etmede yardımcı olduğunu gösteriyoruz.

Anahtar Kelimeler

kantil birim kök testi, şok kalıcılığı, asimetriklik, bilgi etkinliği, varlık fiyatlandırması

INVESTIGATION OF BORSA ISTANBUL'S ASYMMETRIC DYNAMICS WITH QUANTILE AUTOREGRESSION APPROACH

Öz

In this study, we present new evidence with the Koenker-Xiao (2004) quantile unit root test based on the quantile autoregression approach, which provides robust inferences for non-normal processes, to examine the asymmetric dynamic process of the BIST100 Borsa Istanbul index. The quantile autoregression approach allows to measure the persistence of shocks of different magnitudes and signals affecting the stock markets. This approach can catch the adjustment of asymmetrical dynamics in the long-run equilibrium of the index. Therefore, quantile unit root tests add new approaches to stock market dynamics compared to traditional unit root methodologies based on least squares regression method. Our results, although not consistent at all frequencies, show that market behavior not only returns to the mean, but also behaves differently to positive and negative shocks. Compared to traditional unit root tests, quantile unit root tests provide more evidence to support the efficiency of the Turkish stock market. We also show that asymmetric inferences in shock magnitude and sign are helpful in detecting deviations from information efficiency in terms of asset pricing in stock markets.

Anahtar Kelimeler

quantile unit root test, shock persistency, asymmetry, information efficiency, asset pricing

Kaynakça

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