Abstract
Several different methods of gradient analysis, including correspondence analysis and Gaussian ordination, can be characterized as unfolding methods. These techniques are applicable whenever single-peaked response functions are at issue, either with respect to known environmental characteristics or else with respect to data driven reorderings of the sites. Unfolding gives a joint respresentation of the site/species relationships in terms of the distance between two types of points, the location of which can be constrained in various ways. A classification based on loss functions is given, as well as a convergent algorithm for the weighted least squares case.
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Heiser, W.J. (1987). Joint Ordination of Species and Sites: The Unfolding Technique. In: Legendre, P., Legendre, L. (eds) Develoments in Numerical Ecology. NATO ASI Series, vol 14. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-70880-0_5
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DOI: https://doi.org/10.1007/978-3-642-70880-0_5
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