A modification of the Ek–Payandeh nonlinear regression model for site index curves

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Abstract
A new nonlinear regression model for constructing site index curves is described that, unlike previous models based on the Chapman–Richards growth model, produces sets of curves that are constrained to pass through the appropriate height at the index age as well as through the origin. The model was tested on two sets of height–age data, one from published yield tables and the other from stem analyses, and was found to give a good fit in both cases. There was a minimum loss of accuracy compared with a similar, unconstrained model.

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