A model for the diameter-height distribution in an uneven-aged beech forest and a method to assess the fit of such models
By Walter Zucchini, Matthias Schmidt, Klaus von Gadow. 2001
47 citations recorded by the source corpus.
This paper illustrates the application of a mixture model to describe the bivariate diameter-height distribution of trees growing in a pure, uneven-aged beech forest. A mixture of two bivariate normal distributions is considered but the methodology is applicable to mixtures of other distributions. The model was fitted to diameter-height observations for 1242 beech trees in the protected forest Dreyberg (Solling, Germany). A considerable advantage of the model, apart from the fact that it happens to fit this large data set unusually well, is that the individual parameters all have familiar interpretations. The bivariate Johnson SBB distribution was also fitted to the data for the purpose of comparing the fits. A second issue discussed in this paper is concerned with the general question of assessing the fit of models for bivariate data. We show how a device called “pseudoresidual” enables one to investigate the fit of a bivariate model in new ways and in considerable detail. Attractive features of pseudo-residuals include the fact that they are not difficult to interpret; they can be computed using generally available statistical software and, most important of all, they enable one to examine the fit of a model by means of simple graphs.
Subfields: Environmental Engineering, Nature and Landscape Conservation, Plant Science
View Paper: https://www.semanticscholar.org/paper/da5695bd46e729ef048549f54ac753f45fc339f5
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In Environmental Engineering
In Nature and Landscape Conservation
In Plant Science
Citations in the corpus
- Is the reverse J-shaped diameter distribution universally applicable in European virgin beech forests? (2006, background): “Whereas numerous analyses of the diameter distributions of virgin forests have been carried out in North America, to our knowledge only few attempts have been made to investigate diameter distributions of European virgin beech forests with regard to their curve forms and to test the fit of the negat”