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Additivity of component biomass regression equations when the underlying model is linear

Chiyenda S.S.; Kozak A.

Canadian Journal of Forest Research 14(3): 441-446

1984

Results obtained by Kozak (1970) concerning conditions for additivity of component biomass regression equations are formalized and extended. More specifically Kozak demonstrated, using multiple linear regression equations to model 3 biomass components (bole, bark, and crown) for individual tress, that corresponding total biomass can be determined as the sum of the component regression equations, provided that the same independent variables are used in each component equation. Clearly, Kozak's result can be extended to the case of k (.gtoreq. 2) component equations and this case is used to give more general conditions for the additivity problem. Results are also given for the estimation and inference problems associated with fitting the total biomass model using the additivity result. Using the principle of fitting subject to constraints, or what has been termed conditional fitting, demonstrated that additivity of the component equations can be assured even when different independent variables are used in different component equations subject to certain assumptions being met. This principle is then used to generalize the additivity of component regression equations problem and, finally, an example is given to illustrate the application of this generalized additivity theory.

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Related references

**Additivity of nonlinear biomass equations**. Canadian journal of forest research 31(5): 865-878, 2001