Özet:

In finance theory, Market model has been a major issue for decades. Especially, it is used by most of the researchers to estimate financial beta coefficient. It is obvious that there are some weaknesses to use Ordinary Least Squares (OLS) for estimation of the market model. The coefficients estimated by OLS explain only for mid-point of distribution and the OLS estimator does not consider extreme values. Therefore, Quantile Regression technique provides considering outliers and a detailed report while estimating the market model. The aim of the study is investigating the differences of financial beta coefficients on different quantiles via panel quantile regression technique. For this purpose, daily stock returns which traded in Borsa Istanbul and New York Stock Exchange are used for 2011-2015 period. Findings show that financial beta coefficients change for different points of stock returns for both markets.  It is clear that investors which regard differences of the financial beta coefficient on different quantiles prevent the possible strategic mistakes and losses. Besides, findings contain some important evidences about investor behaviors.

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