--- title: >R: Biogeo --- [R 3.0 icon]What does BIOGEO do ? Program BIOGEO computes a hierarchical agglomerative proportional-link linkage clustering with constraint of spatial contiguity, as proposed by Legendre & Legendre (1984b), and presents the results as a series of maps, one for each clustering level. Since the clustering is computed from a similarity matrix, which is of multivariate origin in most instances, then this method may be considered as a form of multivariate mapping. This agglomerative clustering uses a proportional-link linkage algorithm; another program of this package, K-MEANS, allows to compute a non-hierarchical space-constrained clustering. The connectedness of the clustering algorithm is determined by the user, between 0 (for single linkage) and 1 (for complete linkage). Legendre (1987) has shown that the results of constrained clustering are fairly stable through a wide range of values of connectedness. In the Macintosh version, the program is limited to a maximum of 150 simultaneous groups at any one clustering level. Problems larger than 1000 localities have been analyzed using this program; it may become necessary in such cases to request more core memory than attributed to users by default.
Last updated on Saturday, March 30, 2013 by Philippe Casgrain