Tests for and identifies populations within a family of electronics industries. Data include 669 United States and 144 Japanese electronics firms. Demonstrates the relevance of a general organizational classification for explaining how different natural selection processes affect different populations. (75 references) (MLF)

Discussion of quality control of data in online bibliographic databases focuses on authority files. Describes approximate string matching, introduces the concept of approximate word matching and clustering, and presents a case study using the Astrophysics Data System (ADS) that shows how to reduce human effort involved in authority work. (LRW)

Examines the structure of medical informatics and the relationship between biomedicine and information science and information technology. Uses co-occurrence analysis of subject headings assigned to items indexed for MEDLINE as well as multidimensional scaling to show seven to eight broad multidisciplinary subject clusters. (Contains 28…

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…

Using the cluster generation procedure proposed by D. Steinley and R. Henson (2005), the author investigated the performance of K-means clustering under the following scenarios: (a) different probabilities of cluster overlap; (b) different types of cluster overlap; (c) varying samples sizes, clusters, and dimensions; (d) different multivariate…

Today's classrooms increasingly challenge teachers to address a diverse range of backgrounds, abilities, and learning needs. As teachers rise to the challenge, grouping can be a valuable instructional tool to address varying ability levels and learning needs within the classroom. At present, there is a good deal of support in the literature for…

Predictive discriminant analysis involves a technique used in multivariate classification, i.e., in predicting membership in well-defined groups for units on which multiple measures are available. The validation (assessment) of group membership predictions pertains to two problems: estimating true proportions of correct classifications (i.e., hit…

An analysis of survey responses from a sample of aides/orderlies on competency characteristics for their occupation is presented in this document. (Aide/orderly is one of seventeen occupation groups included in this research.) The competencies are reported in five categories: (1) those competencies selected by the respondents from a list of 720…

An analysis of survey responses from a sample of nuclear medical technicians on competency characteristics for their occupation is presented in this document. (Nuclear medical technician is one of seventeen occupation groups included in this research.) The competencies are reported in five categories: (1) those competencies selected by the…

An analysis of survey responses from a sample of operating room technicians on competency characteristics for their occupation is presented in this document. (Operating room technician is one of seventeen occupation groups included in this research.) The competencies are reported in five categories: (1) those competencies selected by the…

An analysis of survey responses from a sample of orthopaedic physician's assistants on competency characteristics for their occupation is presented in this document. (Orthopaedic physician's assistant is one of seventeen occupation groups included in this research.) The competencies are reported in five categories: (1) those competencies selected…

An analysis of survey responses from a sample of respiratory therapists on competency characteristics for their occupation is presented in this document. (Respiratory therapist is one of seventeen occupation groups included in this research.) The competencies are reported in five categories: (1) those competencies selected by the respondents from…

Two studies were undertaken to demonstrate the usefulness of partitioning procedures for studying test items. Achievement test items in five content areas of educational measurement were used as stimuli to be sorted by groups of students with varying levels of sophistication with the content, with the hypothesis that sorting by classes with…

"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…

DISISS (Design of Information Systems in the Social Sciences) is a research project financed by OSTI, which began in January 1971. The objective of the project is to carry out research necessary for the effective design of information systems in the social sciences. The aim of this part of the DISISS project is the application of statistical…