Clustering techniques seek to group together objects or variables that share some observed qualities or, alternatively, to partition a set of objects or variables into mutually exclusive classes whose boundaries reflect differences in the observed qualities of their members. This paper reviews the general principles underlying clustering…

Adjustments made between 1950 and 1960 in the census data classification systems are described in detail. Tables present (1) detailed occupations for 1960 and their 1950 counterparts, showing the 1950 data for both classification systems, and 1960 data for the 1960 classification system, (2) detailed industries for 1960 and their 1950…

There are two distinct but related purposes for carrying out a "discriminant analysis": (1) discrimination, and (2) classification. The primary objective of this paper was to review the outputs of selected computer programs often used to carry out a "discriminant analysis" with respect to these two purposes. Information provided by the programs on…

The report very briefly summarizes the research performed during the contract period March 1, 1964, to February 28, 1971. The emphasis of the research was on the discovery and development of techniques for automatically indexing and classifying documents. The research was limited to statistical techniques rather than semantic or syntactic. A…

The Education Participation Scale was administered to 611 students enrolled in adult education courses at one college in the U. S., and results were compared to results from a similar study in New Zealand. There was some variation in expressed reasons for participation between different sex-age groupings. (Author/AG)

A listing of the program is available from the author at Northwestern University. (MB)

Studied the extent to which job evaluation methods, differing in methodology, and presently used in South Africa, would in fact supply similar classifications. Correlation coefficients among the 16 participating organization job evaluation point ratings indicated high agreement among methods, irrespective of job type and level within the…

Although a variety of studies have indicated that using statistical clustering techniques to examine genetic information may allow for geographically based groupings of individuals that tenuously map onto some conceptions of race, these studies have also indicated that the amount of genetic variation within these groupings is significantly larger…

This study evaluates a large urban district's standards-based promotion policy decisions against a model-driven classification. Hierarchical logistic regression was used to explore factors related to grade retention at both the student and school level. Statistical results indicate that using students' next year achievement test scores as…

Stage theory represents a concise explanation for change in teacher professional development with gained experience in the classroom. This study examines the "self-task-impact" stage chronology proposed by concerns-based theory within the framework of longitudinal research on beginning teaching. The study investigated developmental change in a…

Formulas for estimating cross-validated hit-rates, the number of correct classifications into an a priori grouping structure, were examined. The following mathematical formulas were compared: McLachlan's formula estimator, two Snappin and Knoke smoothed formula estimators, and the analytic leave-one-out estimator. The R method was included as a…

"Classification: Purposes, Principles, Progress, Prospects" by Robert R. Sokal is reprinted in this document. It summarizes the principles of classification and cluster analysis in a manner which is of specific value to the Marine Corps Office of Manpower Utilization. Following the article is a 184 item bibliography on cluster analysis…

There are few existing or widely known measures of agreement applicable when data is nominal or categorical. Most such coefficients are applicable only when judges classify objects or subjects into a single category. A wider range of applications, including those where judges (1) place probabilities on subjects belonging to mutually exclusive and…

Interprets College Interest Inventory, administered to 284 students, both ways, with neither method proving superior. Suggests that under restricted conditions, discriminant function might be more appropriate for counseling purposes than configural analysis. (Author/CJ)