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Published online by Cambridge University Press: 30 September 2009
This paper studies a procedure to combine individualforecasts that achieve theoretical optimalperformance. The results apply to a wide variety ofloss functions and only require a tail condition onthe data sequences. The theoretical results showthat the bounds are also valid in the case of timevarying combination weights.
I am grateful to two anonymous referees and aco-editor for comments that improved the paper inboth content and presentation.