REAL

On plexus representation of dissimilarities

Dale, M. B. (2000) On plexus representation of dissimilarities. Community Ecology, 1 (1). pp. 43-56. ISSN 1585-8553

[img]
Preview
Text
comec.1.2000.1.7.pdf

Download (243kB) | Preview

Abstract

Correspondence analysis has found widespread application in analysing vegetation gradients. However, it is not clear how it is robust to situations where structures other than a simple gradient exist. The introduction of instrumental variables in canonical correspondence analysis does not avoid these difficulties. In this paper I propose to examine some simple methods based on the notion of the plexus (sensu McIntosh) where graphs or networks are used to display some of the structure of the data so that an informed choice of models is possible. I showthat two different classes of plexus model are available. These classes are distinguished by the use in one case of a global Euclidean model to obtain well-separated pair decomposition (WSPD) of a set of points which implicitly involves all dissimilarities, while in the other a Riemannian view is taken and emphasis is placed locally, i.e., on small dissimilarities. I showan example of each of these classes applied to vegetation data.

Item Type: Article
Subjects: Q Science / természettudomány > QH Natural history / természetrajz > QH540 Ecology / ökológia
Depositing User: xBarbara xBodnár
Date Deposited: 09 Nov 2017 07:07
Last Modified: 31 Jul 2020 23:18
URI: http://real.mtak.hu/id/eprint/67100

Actions (login required)

Edit Item Edit Item