In many clustering systems (hierarchies, pyramids and more generally weak hierarchies) clusters are generated by two elements only. This paper is devoted to such clustering systems (called binary clustering systems). It provides some basic properties, links with (closed) weak hierarchies and some qualitative versions of bijection theorems that occur in Numerical Taxonomy. Moreover, a way to ass...

We describe our approach to document representation that captures contextual dependencies between terms in a corpus and makes use of these dependencies to represent documents. We have tried our representation scheme for automatic document categorisation on the Reuters’ test set of documents. We achieve a precision recall break even point of 84% which is comparable to the best known published re...

Interest in implementation science and recent calls for consequentialist epidemiology urge epidemiologists to produce work more immediately applicable to public health practice. A clear vocabulary for such approaches is lacking. Here, we present a potential taxonomy of causal effects, distinguishing between "exposure effects" more relevant to patients and individuals; and "population interventi...

This paper presents a taxonomy of existing approaches for using response surfaces for global optimization. Each method is illustrated with a simple numerical example that brings out its advantages and disadvantages. The central theme is that methods that seem quite reasonable often have non-obvious failure modes. Understanding these failure modes is essential for the development of practical al...

A total of 102 strains received as Corynebacterium 'group JK' were characterized by SDS-PAGE of their whole-cell proteins. Numerical taxonomy based on the protein pattern absorbance profiles indicated that 91 of the strains formed a cluster. Seventy strains isolated in the UK were identified as group JK, indicating the increasing detection of this group as opportunistic pathogens. Fine differen...

What sort of country has Russia become since the collapse Soviet Union? Scholars have tracked Russia’s political economy closely for almost three decades but yet to agree on a method classifying it. Using cluster analysis and eleven different measures political, economic, social development, article constructs numerical taxonomy nineteen other countries. The results show that, most part, no lon...