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Vector generalized additive models in plant ecology

Research output: Contribution to journalArticle

Abstract

The class of vector generalized linear and additive models (VGLMs and VGAMs) are very large and encompasses many statistical distributions and models. In particular, the classical exponential family containing the normal, binomial and Poisson are a small subset of this family. VGLMs/VGAMs extend GLMs/GAMs by allowing more than one linear/additive predictor. VGLMs are primarily model-driven while its nonparametric counterpart, VGAMs, are more data-driven due to the use of vector smoothers. A very convenient vector smoother is the vector (smoothing) spline, which is a generalization of the cubic smoothing spline to correlat vector responses. In this paper, VGLMs and VGAMs are described and illustrated using examples that are of particular relevance to plant ecologists. It is attempted to show that VGAMs offer greater scope for additive modeling. Use of S-PLUS/R software written by the first author is illustrated on a few data sets using several statistical models, which include the negative binomial, beta distribution and the bivariate logistic model. Details of how the software can be obtained are provided. (C) 2002 Elsevier Science B.V. All rights reserved.

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Original languageEnglish
Pages (from-to)141-156
Number of pages16
JournalEcological Modelling
Volume157
Publication statusPublished - 30 Nov 2002

    Research areas

  • canonical correspondence analysis, nonparametric regression, reduced-rank regression, smoothing, vector generalized additive models, vector generalized linear models, DISCRIMINANT-ANALYSIS, REGRESSION-MODELS, LINEAR-MODELS, LIKELIHOOD, SQUARES, CURVES

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