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Generalized Error Structure for Forestry Yield Models

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The combined time-series cross-sectional nature of remeasurement data from permanent forest plots is examined with an aim toward improving the precision of yield models fitted with these data. The linear model error term is regarded as an aggregation of plot, time period, and residual random effects with possibly distinct variances and correlations. Four alternative error covariance structures are posited that differ in the manner in which serial correlation, plot variance heterogeneity, and cross-plot correlations are prescribed. Yield models with the presumed error covariance specifications were fitted to a panel of 65 pure, even-aged Douglas-fir plot remeasurements, using two-stage generalized least squares and, in one case, a full maximum likelihood estimation. Ordinary least squares results were used as a basis for comparison. Comparison of the fitted models by prediction error and likelihood criteria indicate ordinary least squares nearly always performs better by the former measure, whereas one or more of the alternate specifications always have higher likelihood. For. Sci. 33(2):423-444.

Keywords: Error components models; panel data; time-series cross-section data

Document Type: Journal Article

Affiliations: Assistant Professor of Forest Biometrics, School of Forestry and Wildlife Resources, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061

Publication date: 1987-06-01

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
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