Nonlinear mixed-effects modeling of variable-exponent taper equations for lodgepole pine in Alberta, Canada

@article{Yang2009NonlinearMM,
  title={Nonlinear mixed-effects modeling of variable-exponent taper equations for lodgepole pine in Alberta, Canada},
  author={Yuqing Yang and Shongming HuangS. Huang and Guillermo Trincado and Shawn X. Meng},
  journal={European Journal of Forest Research},
  year={2009},
  volume={128},
  pages={415-429}
}
Four variable-exponent taper equations and their modified forms were evaluated for lodgepole pine (Pinus contorta var. latifolia Engelm.) trees in Alberta, Canada. A nonlinear mixed-effects modeling approach was applied to account for within- and between-tree variations in stem form. Even though a direct modeling of within-tree autocorrelation by a variance–covariance structure failed to achieve convergence, most of the autocorrelation was accounted for when random-effects parameters were… CONTINUE READING

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