Skip to main content

Estimating a Multilevel Dominant Height‐Age Model from Nested Data with Generalized Errors

Buy Article:

$29.50 plus tax (Refund Policy)

A dominant height‐age model was developed following a multilevel nonlinear mixed-model approach. Random effects were modeled at the plot and the tree levels, with two random parameters at each level. In addition to the random effects, a variance function was used to model heteroscedasticity, and various covariance structures were evaluated to account for residual autocorrelation. A new covariance structure, the modified spatial power structure, is proposed. This new structure was found to provide the best fit to the model. Although residual autocorrelations were still not completely removed by this structure, they were substantially reduced. Model validation results using an independent data set confirmed that the final model with the modified spatial power structure produced more accurate and precise dominant height predictions. This was true for both expansion methods, and the empirical best linear unbiased predictor (EBLUP) expansion showed better results than the ZERO expansion. The model with the modified spatial power structure fitted by the EBLUP expansion method, therefore, was chosen as the preferred model for making tree-specific, dominant height predictions. The advantages and relevance of the multilevel nonlinear mixed-model approach for forest growth and yield modeling are discussed.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Keywords: five-band Toeplitz covariance structure; modified spatial power covariance structure; multilevel nonlinear mixed model; subject-specific prediction

Document Type: Research Article

Publication date: 2011-04-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
  • Submit a Paper
  • Membership Information
  • Author Guidelines
  • Podcasts
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more