The singular value decomposition and its interpretation as a linear biplot has proved to be a powerful tool for analysing many forms of multivariate data. Here we adapt biplot methodology to the speci¯c case of compositional data consisting of positive vectors each of which is constrained to have

This paper examines how to obtain species biplots in unconstrained or constrained ordination without resorting to the Euclidean distance (used in principal component analysis, PCA, and redundancy analysis, RDA) or the chi-square distance (preserved in correspondence analysis, CA, and canonical

and objects. It is commonly used in ecological applications to plot relationships between species and sites. This paper describes a set of Excel macros that may be used to draw a biplot display based on results from principal components analysis, correspondence analysis, canonical discriminant analysis

ABSTRACT. Six varieties/strains belonging to three species of Cymbopogon, viz., C. flexuosus, C. khasianus and C. pendulus, or their hybrids, were evaluated for oil yield across four years (1997-98-2000-01) as very limited information is available on variety-by-environment interaction from multi

Abstract This paper examines how to obtain species biplots in unconstrained or constrained ordination without resorting to the Euclidean distance [used in principalcomponent analysis (PCA) and redundancy analysis (RDA)] or the chi-square distance [preserved in correspondence analysis (CA

analysis, biplot, ordination diagram, species-environment relations. 2

was observed for the methanol extract of P. maliformis against B. subtilis. Generally, extracts from the Passiflora species exhibit distinct inhibition against Gram-positive but not Gram-negative bacteria. Based on the generated biplot, three clusters of bacteria were designated according to their performance

Abstract The detection and incorporation of genes from wild plant species provides a means for sustaining genetic improvement in plants cultivated in arid environments. This research measured relative levels of drought tolerance in several genotypes of cultivated (Carthamus tinctorius) and wild

variables was used to classify the Passiflora species. The biplots generated five distinct groups discriminated by morphological variables. The group consisted of cultivars of P. edulis with high levels of genetic similarity; in contrast, P. foetida was highly divergent from other species

. maliformis against B. subtilis. Generally, extracts from the Passiflora species exhibit distinct inhibition against Gram-positive but not Gram-negative bacteria. Based on the generated biplot, three clusters of bacteria were designated according to their performance towards the tested extracts. The present