... classified according to the real sampling effort in the following groups: Group 1: Low sampling effort models, including those models which need diameter measurements and knowledge of age in some cases ... Group 2: Medium sampling effort models, including models which need measurements of diameter and of a sample of tree heights Group 3: High sampling effort models, including models which need the ... practical information-theoretic approach, Springer-Verlag, New York, 1998 A height-diameter model for Pinus radiata [8] Caủadas N., Garcớa C., Montero G., Relaciún altura-diỏmetro para Pinus pinea...