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Measuring the height of a tree like Gmelina Arborea takes longer than measuring its diameter at breast height and often only the heights of a subset of trees of known diameter are measured in the forest inventories. Since trees with the same diameter are not usually of the same height, even within the same stand, a simultaneous equation techniques and multiple regression equation was used to fit the height-diameter data obtained from the Gmelina Arborea Plantation at Federal College of Forestry, Ibadan. This approach mimics the natural variability of height/dbh and therefore provides more realistic height/dbh predictions with the multiple regressions while the simultaneous equation techniques failed due to poor fit.

Parameter estimation of height-diameter relationships of Gmelina arborea Roxb. (Family Verbenaceae)