Fig. 2From: Allometric models for estimating aboveground biomass in the tropical woodlands of Ghana, West AfricaInfluence of wood density classes on model bias. The models that have wood density as a predictor are M2, M3, M6 and M7. Chave et al. (2014) model serves as a reference model. The theoretical bias is zero and density classes with mean bias close to zero had positive influence on the bias of the modelBack to article page