Paper Title:
Modeling Branch Length of Larch Tree Using Linear Mixed-Effects Models
  Abstract

In this study, the sample data was based on 2190 branch length samples of 30 trees from dahurian larch (Larix gmelinii Rupr.) plantations located in Wuying forest bureau in Heilongjiang Province. A second order polynomial equation with linear mixed-effects was used for modeling branch length of larch tree. The LME procedure in S-Plus is used to fit the mixed-effects models for the branch length data. The results showed that the polynomial model with three random parameters could significantly improve the model performance. The fitted mixed effects model was also evaluated using mean error, mean absolute error, mean percent error, and mean absolute percent error. The mixed model was found to predict branch length better than the original model fitted using ordinary least squares based on all errors. The application of mixed branch length model not only showed the mean trends of branch length, but also showed the individual difference based on variance-covariance structure.

  Info
Periodical
Chapter
Chapter 5: Frontiers of Environment Engineering and Materials
Edited by
Dongye Sun, Wen-Pei Sung and Ran Chen
Pages
3007-3011
DOI
10.4028/www.scientific.net/AMM.71-78.3007
Citation
R. Zhang, L. C. Jiang, F. R. Li, Y. X. Li, "Modeling Branch Length of Larch Tree Using Linear Mixed-Effects Models", Applied Mechanics and Materials, Vols. 71-78, pp. 3007-3011, 2011
Online since
July 2011
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Price
$32.00
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