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Title: Minimizing bias in biomass allometry: Model selection and log transformation of data
Author: Mascaro, Joseph; undefined, undefined; Hughes, Flint; Uowolo, Amanda; Schnitzer, Stefan A.
Source: Biotropica (online)
Description: Nonlinear regression is increasingly used to develop allometric equations for forest biomass estimation (i.e., as opposed to the raditional approach of log-transformation followed by linear regression). Most statistical software packages, however, assume additive errors by default, violating a key assumption of allometric theory and possibly producing spurious models. Here, we show that such models may bias stand-level biomass estimates by up to 100 percent in young forests, and we present an alternative nonlinear fitting approach that conforms with allometric theory.
Keywords: allometry, Hawai‘i, heteroscedasticity, linear regression, nonlinear regression analysis, Psidium cattleianum
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Mascaro, Joseph; Litton, Creighton M.; Hughes, R. Flint; Uowolo, Amanda; Schnitzer, Stefan A. 2011. Minimizing bias in biomass allometry: Model selection and log transformation of data. Biotropica.
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