A technique is presented to transform incomplete categorical data into complete data by imputing appropriate scores into missing cells. A solution of the optimization problem is suggested, and relevant psychometric theory is discussed. The average correlation should be at least 0.50 before the method becomes practical. (SLD)

A study analyzed data from four national surveys of the American professoriate conducted between 1969 and 1988. To assess whether groups of institutions might be accumulating advantage relative to others, research activities were compared across five Carnegie institution types. An overall strengthening of research emphasis and other changes…

Describes the differences between and within American secondary schools. Types of schools are discussed, and institutional analyses are recommended for creating ethnological typologies. School culture is suggested as a basis for typology. Three comprehensive and supposedly similar public high schools are examined, and their significant cultural…

Describes hypertext and discusses the need for classification schemes in hypertext knowledge bases. The process for finding and using information in libraries is considered; the use of classification in libraries is discussed, including the development of library catalogs; an example of hypertext with a classification structure is described; and…

The degree of agreement between two raters rating several objects for a single characteristic can be expressed through an association coefficient, such as the Pearson product-moment correlation. How to select an appropriate association coefficient, and the desirable properties and uses of a class of such coefficients--the Euclidean…

Examines historical and current difficulties in information retrieval, including the tendency of technology, because of the problems of scale and distribution, to make information invisible to users. Attempts to organize networked resources are described, and serendipity is proposed as a model for future retrieval. (two references) (MES)

Describes a project that examined textual information available on the Internet and potential means of providing access to this information. Highlights include an overview of Internet resources, a profile of a document sample, description of FTP (File Transfer Protocol) sites, and an automated method of categorizing files. (MES)

Describes the study of sandy beach zonations as a seashore activity for either high school or lower-level college courses in biology, ecology, or marine biology. Students first draw a profile of a beach scene and then collect specimens from the zones of the shore. In a laboratory, students identify their specimens and relate them to the beach…

Examines usage scenarios for a database of descriptive information to access networked information resources such as online library catalogs, file archives, online journal article repositories, and information servers. Existing classification schemes and their usefulness for networked information resources are discussed. Specific data elements…

One hundred students (ages 6-8) described similarities and differences among exemplars of different categories, identified the categories, and named the exemplars. Large performance differences were found between normally achieving and mildly retarded groups and between mildly retarded and learning-disabled groups, with small performance…

This article addresses the continuity from early speech-language delays to later learning problems in school and recommends use of "language organization disorder" to describe the delay. Chronologies of the difficulties and methods for early detection are provided. A table summarizes 11 research studies on early language delays and later reading…

It is argued that there are only three core instructional models (behavior, development, and apprenticeship) and that within the framework of these models, only five types of knowledge can be acquired: (1) declarative; (2) procedural; (3) conceptual; (4) analogical; and (5) logical. Examples are presented. (SLD)

Scores from 324 Louisiana schools on the Louisiana Graduation Exit Examination and a within-school split sample of 255 schools indicate that a single subject or grade provides a less consistent and more narrow perspective on school effectiveness than a subcomposite made up of 2 subject areas. (SLD)

Research in the field of developmental disabilities has found direct links between severity of a personality trait or psychopathology and particular pathology of the deoxyribonucleic acid (DNA). From studies of behavior phenotypes, new psychiatric disorders are being recognized, such as Williams syndrome. The formulation of valid behavior…

Considers the role and effectiveness of virtual reality in simulation-based training. The theoretical and practical implications of verity, integration, and natural versus artificial interface are discussed; a three-dimensional classification scheme for virtual reality is described; and the relationship between virtual reality and other…