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The study of the relationship between average realized stock returns and the risk of stock investment
 Řípa, Daniel ; Bašta, Milan (advisor) ; Cícha, Martin (referee)
Bachelor thesis deals with the topic of average return rates of stock investments and assessment of their risk. The aim of this work is a comparison of two alternative approaches of risk measurement. Twenty years long time series of 30 stocks' returns from 1991 to 2010 are first used to analyze a relationship between average realized returns and standard deviations of the returns. Variety of computational algorithms is used in attempt to generalize this relationship. Analysis of the full length time series does not seem to discover a significant mutual relationship in the analyzed dataset. However, by analogically employing the algorithm of the CAPM analysis a significant and positive linear relationship between standard deviations and realized returns was found. Furthermore, two-step regression algorithm introduced by Fama & MacBeth is used to test the validity of CAPM model. This method led to the conclusion that CAPM cannot be rejected within the analyzed dataset. Moreover, strong positive linear relationship was found between the estimates of standard deviation and beta coefficients, which may be explained by the lack of variability in correlation between individual assets' and market portfolio's returns.
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