Drivers of expected returns in Istanbul stock exchange: Fama-French factors and coskewness

E. Ulas Mısırlı and C. Emre Alper

Applied Economics, 2009, vol. 41, issue 20, 2619-2633

Abstract: We investigate the impact of coskewness on the variation of portfolio excess returns in Istanbul Stock Exchange (ISE) over the period July 1999 to December 2005. We form portfolios according to size, industry, size and book-to-market ratio, momentum and coskewness and compare alternative asset pricing models. The traditional capital asset pricing model (CAPM) and the three-factor model of Fama and French are tested in the multivariate testing procedure of Gibbons-Ross-Shanken (1989). Coskewness is introduced as a fourth factor and its incremental effect over CAPM and Fama-French factors is examined both in multivariate tests and in cross-sectional regressions. The findings reveal that coskewness is able to explain the size premium in ISE. Hence, the basic two-moment CAPM without the coskewness factor would underestimate the expected return of size portfolios. Multivariate test results indicate that coskewness reduces the pricing bias, albeit insignificantly. Cross-sectional analysis uncovers that coskewness has a significant additional explanatory power over CAPM, especially for size and industry portfolios. However, coskewness does not have a significant incremental explanatory power over Fama-French factors in ISE.

Date: 2009
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DOI: 10.1080/00036840701222611

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