Journals / Doğuş Üniversitesi Dergisi / 2005 / Cilt: 6 - Sayı: 1

IMKB Betas, Correlation and Variability

İMKB Betaları, Korelasyon Tahmini ve Değişkenlik

Pages
28–34
DOI
—
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

It is shown that in spite of the periodical changes the overall mean correlation coefficient outperforms the other methods in terms of average absolute error.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Betas of 46 İMKB companies are computed and adjusted according to Blume and Vasicek techniques.
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Key Findings & Data:Then using the historical and adjusted betas, correlation coefficients of the stocks are calculated.
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Conclusion & Impact:It is shown that in spite of the periodical changes the overall mean correlation coefficient outperforms the other methods in terms of average absolute error.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:korelasyon · correlation

Abstract

Betas of 46 İMKB companies are computed and adjusted according to Blume and Vasicek techniques. Then using the historical and adjusted betas, correlation coefficients of the stocks are calculated. The method which gives the minimum average absolute error between the correlation coefficients is searched. It is shown that in spite of the periodical changes the overall mean correlation coefficient outperforms the other methods in terms of average absolute error. In order to test the variability of beta coefficients with 12 months data length, a transition matrix is used and shown that the risk class of the stocks change frequently between the period examined.

Özet

Bu çalışmada IMKB'ye kayıtlı 46 adet hisse senedinin betaları hesaplanmış ve Blume ve Vasicek tekniklerine göre düzeltmeleri yapılmıştır. Daha sonra tarihi ve düzeltilmiş betalardan hareket ederek hisse senetleri arasındaki korelasyonlar hesaplanmış, tahmin edilen korelasyonlar ile gerçekleşen korelasyonlar arasındaki mutlak farkı en küçük kılacak yöntemin hangisi olduğu gösterilmeye çalışılmıştır. Ortalama mutlak hatası en düşük olan teknik farklı dönemler için değişmekle birlikte, genel ortalama korelasyon katsayısının performansı tercih edilebilir bulunmuştur. Betaların, değişkenliğini test etmek için 12 aylık veri uzunluğu esas alınarak geçiş matrisi oluşturulmuş, sonuç olarak sözkonusu hisse senetlerinin dönemler itibariyle risk sınıflarının sıklıkla değiştiği gösterilmiştir.

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Cite This Article

BEYAZIT, M. F. (2005). IMKB Betas, Correlation and Variability. Doğuş Üniversitesi Dergisi, Cilt: 6 - Sayı: 1, 28–34. https://ajindex.com/articles/129033

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References (1)

  1. BAESEL, B.J. (1974) On the assesment of risk: some further considerations, The Journal of Finance, Vol 29. (5), 1491-1494.ss. BLUME, E.M. (1970) Portfolio theory: a step toward its practical application. The Journal of Business, Vol 43. (2), 152-173.ss. BLUME, E.M. (1971) On the assesment of risk. The Journal of Finance, Vol 26. (1), 1-10 ss. BLUME, E.M. (1975) Betas and their regression tendencies. The Journal of Finance,Vol 30. (3), 785-795 ss. BRENNER, M. ve SMIDT, S. (1977) A simple model of non-stationarity of systematic risk. The Journal of Finance, Vol 32. (4), 1081-1092 ss. EDWIN, J.E., GRUBER, J. M. ve URICH, J.T.(1978) Are Betas Best ?. The Journal of Finance, Vol 33. (5), 1375-1384 ss. KON, J. S. ve LAU, W. P. (1979) Specification test for portfolio regression parameter stationarity and the implications for empirical research. The Journal of Finance, Vol 34. (2), 451-465.ss. ROENFELDT,L.R., GRIEPENTROG, L.G. ve PFLAUM, C. C. (1978). Further evidence on the stationarity of beta coefficients. The Journal of Financial and Quantitative Analysis, Vol 13. (1), 117-121.ss. SCOTT, E. ve BROWN, S.(1980). Biased estimators and unstable betas. The Journal of Finance, (1980) Vol 35.(1) 49-55 ss. THEOBALD, M. (1981). Beta stationarity and estimation period: some analytical results. The Journal of Financial and Quantitative Analysis, Vol 16. (5), 747-757.ss. VASİCEK, A. 0.(1973) A Note on using cross- sectional information in bayesian estimation of security betas. The Journal of Finance, Vol 34. (2), 451-465 ss.