Site index curves in eucalyptus plantation obtained by quantile regression

Authors

  • Carlos Alberto Araújo Júnior Universidade Federal de Viçosa, Departamento de Engenharia Florestal, Avenida Purdue, s/no, Campus Universitário, Edificio Reinaldo de Jesus Araújo, CEP 36570‑900 Viçosa, MG.
  • Carlos Pedro Boechat Soares Universidade Federal de Viçosa, Departamento de Engenharia Florestal, Avenida Purdue, s/no, Campus Universitário, Edificio Reinaldo de Jesus Araújo, CEP 36570‑900 Viçosa, MG.
  • Helio Garcia Leite Universidade Federal de Viçosa, Departamento de Engenharia Florestal, Avenida Purdue, s/no, Campus Universitário, Edificio Reinaldo de Jesus Araújo, CEP 36570‑900 Viçosa, MG.

DOI:

https://doi.org/10.1590/S1678-3921.pab2016.v51.21844

Keywords:

Eucalyptus, outliers, guide curve method, ordinary least squares, percentile

Abstract

The objective of this work was to obtain site index curves in eucalyptus plantations by quantile regression, and to compare them to the obtained ones with the use of fitted regressions by the method of ordinary least squares. Quantile regression can be used to generate site index curves, especially in the presence of outliers. The method generates a bundle of curves better adjusted to the observed data, compared to the one generated with the estimates of ordinary least squares, either by the guide curve method (anamorphic curves) or by polymorphic curves (using different percentiles).

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Published

2016-08-23

How to Cite

Araújo Júnior, C. A., Soares, C. P. B., & Leite, H. G. (2016). Site index curves in eucalyptus plantation obtained by quantile regression. Pesquisa Agropecuaria Brasileira, 51(6), 720–727. https://doi.org/10.1590/S1678-3921.pab2016.v51.21844

Issue

v.51, n.6, jun. 2016

Section

QUANTITATIVE METHODS