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Factoring Characteristics into Returns: A Clinical Approach to Fama-French Portfolio Decomposition

This paper thoroughly analyses competing construction methods for factoring characteristics into returns. We show the importance of ensuring a proper diversification of the factor's portfolio const ...

Auteur(s) :

Boris Fays

PhD candidate, University of Liège

Georges Hübner

Professor of Finance, University of Liège
Associate Professor, Maastricht University

Marie Lambert

Research Associate, EDHEC-Risk Institute

This paper thoroughly analyses competing construction methods for factoring characteristics into returns. We show the importance of ensuring a proper diversification of the factor's portfolio constituents for producing relevant and unbiased risk factors or benchmark portfolios. This is an important issue to be solved for asset pricing and performance models defined as a function of characteristics. As a practical case, the paper works on the design of size and value spread portfolios à la Fama-French. This quasi-clinical investigation examines three methodological choices that have an impact on portfolio diversification: the (in)dependence and the (a)symmetry of the stock sorting procedure, and the sorting breakpoints. A sequential and symmetric sort of stocks into long and short portfolios conditioned on control variables produces unbiased factors. Our results are stronger when whole firm samples are used to define breakpoints and are also robust to the inclusion of a third dimension in the multiple sorting.

Type : Working paper
Date : le 01/06/2018
Pôle de recherche Finance

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