Describes a clustering algorithm designed for dynamic data bases and presents an update procedure which maintains an effective document classification without reclustering. The effectiveness of the algorithms is demonstrated for a subset of the Cranfield collection. (Author)

This index was developed primarily to define the industrial and occupational classification systems adopted for the 1970 Census of Population. For each category in the classification systems it presents the individual titles constituting the particular category. Approximately 19,000 industry and 23,000 occupation titles are included. These titles…

Graphical methods for evaluating the fit of Johnson's hierarchical clustering schemes are presented together with an example. These evaluation methods examine the extent to which the clustering algorithm can minimize the overlap of the distributions of intracluster and intercluster distances. (Author)

Addresses selecting among and using the numerous quantitative job classification procedures, with a focus on the decision-making tasks and practical difficulties that confront users of each. (Author/ABB)

Using examples of data from the areas of information retrieval and of multivariate data analysis, six hierarchic clustering algorithms (single link, median, centroid, group average, complete link, Wards's) are examined and evaluated by using three proposed coefficients of hierarchic structure. Nine references are cited. (EJS)

A measure for the quantification of the changes in classification under small changes in data is proposed. (Author)

This study compared the accuracy of predicting two-group membership obtained from K-means clustering with those derived from linear probability modeling, linear discriminant function, and logistic regression under various data properties. Multivariate normally distributed populations were simulated based on combinations of population proportions,…

ISDED, designed as an international classification system but adaptable to national systems, is an inter-departmental project of Unesco administered by the Office of Statistics. A three stage, five digit system by level, field and programme, ISCED consists of over 450 categories of education with their respective definitions. (JB)

Results indicated that Ss demonstrating a high degree of clustering recalled more than Ss demonstrating a low degree of clustering. (Authors)

Patents are clustered by similar cited-by" patterns using MacQueen's algorithm. The clusters are enriched by the addition of citing patents. These maximally connected clusters, or cliques, form the classification. (27 references) (Author)

A method is described for bifurcating a matrix of objects into two submatrices such that the sum of average deviations of the members from the central tendencies of the two submatrices is minimized. Illustrations of the procedure are included. (DG)

The results of a questionnaire suggested that therapists and patients do not view therapy within the same frame of reference. (CK)

Addresses the application of automatic classification methods to the problems associated with computerized document retrieval. Different kinds of classifications are described, and both document and term clustering methods are discussed. References and notes are provided. (Author/JD)