Alternatif Sistematik Risk Ölçütleri ile Sermaye Varlıkları Fiyatlama Modelinin Borsa İstanbul'da Test Edilmesi

Bu çalışmada, betanın zaman içinde değişmesine izin veren koşullu Sermaye Varlıklarını Fiyatlama Modeli’nin (SVFM) ve betanın sabit olarak kabul edildiği statik SVFM’nin geçerliliği Borsa İstanbul’da (BİST) test edilmiştir. BİST üzerine yapılan diğer çalışmalardan farklı olarak, koşullu SVFM testlerinde beta ay için- deki günlük getiri verileri kullanılarak hesaplanmıştır. Sonuçların tutarlılığını test etmek için, değişken betalar önceki yirmi dört aylık getiri verisi kullanılarak ha- reketli beta olarak da hesaplanmıştır. Sonuç olarak, statik ve koşullu SVFM’nin BİST’de geçerli olmadığı saptanmıştır. Ayrıca örneklem kriz öncesi, kriz ve kriz sonrası dönemlerine ayrılarak, testler bu alt dönemler için de yapılmıştır. Alt dö- nemler için elde edilen sonuçlar da tüm örneklem sonuçlarını desteklemektedir. Diğer taraftan fiyat-defter değeri oranının ise ortalama hisse senedi getirisi üze- rinde anlamlı bir etkiye sahip olduğu bulunmuştur.

Testing the Capital Asset Pricing Model in İstanbul Stock Exchange with Alternative Systematic Risk Measures

We test the validity of the conditional Capital Asset Pricing Model (CAPM) where beta is allowed to vary through time and of the static CAPM where beta is assu- med to be constant in the İstanbul Stock Exchange (ISE). Unlike previous studies on ISE, daily returns within a month are used to estimate monthly betas. As a ro- bustness check, we also use monthly return data of the past twenty four months to estimate monthly betas on a rolling basis. We conclude that the conditional and static CAPM are not valid for ISE. We perform our tests for the pre-, post and during the crisis periods. Sub-period test results also support full sample results. Furthermore, we find that the ratio of stock price to book- value-per-share has a significant impact on average stock returns.

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