出版社：Ege University, Faculty of Economics and Administrative Sciences
摘要：Estimation of Beta coefficient is backbone of the modern portfolio theory. The studies seen in the finance literature point that it cannot be talked about unique stable beta coefficient for an individual financial asset. In other words, a variety of beta coefficient depends on the calculation methods of returns, the chosen index as a representative of the market and the estimation period. This paper examines whether return interval effect is seen in The Istanbul Stock Exchange for the period of 2000-2007. This paper concludes that beta instability is existence in the ISE and there is not any effect of estimation period on the stability
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