Data-processing in phytosociology

(RANKIN) of equivocation information (1-:) and interaction information (M). The method is described in the present paper for I: and in a previous paper (Orloci, 1976) for M. The results presented in this paper suggest that for Species Rank order Information Percentage of total species to be weighted according to their suitability to I· M I M r M characterize isolated groups of releves in a phytosociolo 5 7 54.15 2.31 17.97 0.82 gical table, the equivocation information may serve as a 9 5 49.86 23.19 16.55 8.22 3 3 9 47.79 0.56 15.86 0.20 suitable weight. The appropriate formulations are derived 6 4 8 36.18 1.18 12.01 0.42 4 5 3 24.36 59.34 8.09 21.03 and computed for some data from a salt marsh community. 8 6 4 24.25 39.04 8.05 13.84 10 7 I 21.96 71.17 7.29 25.23 7 8 2 18.67 69.01 6.20 24.46 9 10 18.40 6.11 10 6 5.64 16.31 1.87 5.78 References Total 301.00 282.11 * 100.00 100.00 Feoli, E. 1973. An index for weighing characters in monothetic classifications. (Italian with English summary). Giorn. Bot. Ita!' 107: 263-268. Gower, J.e. 1967. A comparison of some methods of cluster is a monotone, increasing function of sample size if .. ).

Contenu
Data-processing in phytosociology: Retrospect and anticipation.- TRGRPSAn interactive algorithm for group recognition with an example from Spartinetea.- Deux applications en phyto-écologie de la notion de limite 'optimale'.- A system for coding plant species for data-processing in phytosociology.- A numerical classification of European Spartina communities.- Une utilisation possible de l'arbe de portée minimale en phyto-écologie.- On the resolving power of principal component analysis in plant community ordination.- A criterion for monothetic classification of phytosociological entities on the basis of species ordination.- The concept of structure in phytosociology with references to classification of plant communities.- Delimitation and ranking of floristic-sociological units on the basis of relevé similarity.- Application of constancy-species groups for numerical ordering of phytosociological tables - The synoptic table version.- Ranking species based on the components of equivocation information.- A phytosociological survey of the Irish Molinio-Arrhenatheretea using computer techniques.- TABORD: A program for structuring phytosociological tables.- Automatic classification of phytosociological data on the basis of species groups.- Transformation of cover-abundance values in phytosociology and its effects on community similarity.- Relevé ranking based on a sum of squares criterion.- Hierarchical classification of European sail marsh vegetation based on numerical methods.- Analysis of concentration and detection of underlying factors in structured tables.- Intersection analysis in phytosociology: Computer program and application.- CLUSLA: A computer program for the clustering of large phytosociological data sets.- Elements for a system of data processing in phytosociology and ecology.- Data-processing in phytosociology: conclusions and perspective.- Survey of salt marsh relevés included in the data-bank of the working-group for data-processing.- References to original publications in Vegetatio.