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Titolo:
ON THE INCOMPATIBILITY OF THE CHORD DISTANCE WITH SOME CLASSIFICATIONAND ORDINATION ALGORITHMS USED IN STUDIES OF PLANT-COMMUNITIES
Autore:
KARADZIC B; POPOVIC R;
Indirizzi:
INST BIOL RES DR SINISA STANKOVIC YU-11060 BELGRADE YUGOSLAVIA
Titolo Testata:
Zurnal obsej biologii
fascicolo: 4, volume: 54, anno: 1993,
pagine: 430 - 437
SICI:
0044-4596(1993)54:4<430:OTIOTC>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIMULATED VEGETATIONAL DATA; MODELS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
30
Recensione:
Indirizzi per estratti:
Citazione:
B. Karadzic e R. Popovic, "ON THE INCOMPATIBILITY OF THE CHORD DISTANCE WITH SOME CLASSIFICATIONAND ORDINATION ALGORITHMS USED IN STUDIES OF PLANT-COMMUNITIES", Zurnal obsej biologii, 54(4), 1993, pp. 430-437

Abstract

Mathematical meaningful of some numerical methods used in studies of plant communities was analysed in this paper. Although methods combining the chord distance with some classification and ordination algorithms were frequently used in vegetational studies such combinations are improper in a mathematical sense. The chord distance is a quantitativemeasure of compositional dissimilarity between plant communities. This measure is derivable from the Euclidean distance after a standardization of vegetational samples to equal totals. The standardization implicitly translates samples to an unit radius hypersphere. Sphericity ofthus transformed Euclidean space restricts the compatibility of the chord distance and algorithms of PCA as well as both Orloci's <<optimalclustering>> and centroid clustering. The incompatibility is attributable to a mismatch between the geometrical properties of an n-dimensional unstandardized Euclidean spare and corresponding n-dimensional hypersphere. Admissible combinations of the chord distance and these classification and ordination algorithms were presented in this paper.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 15:03:11