A large number of long-only multi-factor strategies have performed disappointingly over the past three years. Some have called into question the usefulness of solutions based on factor diversification but recent research by EDHEC suggests this doesn’t hold up against an even remotely serious investigation.
Daniel Aguet, Noël Amenc and Felix GoltzSeptember 20, 2019
The size factor has recently come under attack from smart beta providers because its performance has lagged behind other factors. A common recommendation is to remove size from the factor menu, to give more weight to factors with better performance. But due to its low correlation with other factors, size offers substantial diversification benefits.