CLEMENTS, Michael P. and David F. HENDRY (2002a), Modelling Methodology and Forecast Failure, Econometrics Journal, 5 … Statistical Society, Series A, 137, 131-165. -- ELLIOTT, Graham and Allan TIMMERMANN (2005), Optimal Forecast Combination under … Regime Switching, International Economic Review, 46, 1081-1102. -- CAPISTRÁN, Carlos and Allan TIMMERMANN (2009), Forecast …