Structural equation modeling was used to investigate the relation between home environment, self-concept, and academic achievement. It was found and cross-validated over four samples of 2,297 Korean adolescents that self-concept is a mediating variable between home environment and academic achievement. (Author/BS)

Describes an iterative method of document retrieval similar to relevance feedback in that user feedback is utilized in subsequent iterations. However, this method compares retrieved documents with each other using algebraic formulae which determine the boundaries of the area that contains descriptions of relevant documents. Fifteen references are…

Activities are given for solving verbal subtraction problems. Take-away and comparison situations are described, and three levels of activities to model the situations are given: one involving concrete materials and verbal descriptions; the second with these plus written symbols; and the third encouraging mental images. (MNS)

A number of models are proposed of the effects of demographic and environmental factors on IQ and its pattern of change over time. The proposed models are concerned with the determinants of an individual's true (but unobserved) IQ and the relationship between measured and true IQ's. (Author/RC)

Cut-and-try techniques that point to appropriate transformations of variables and to the selection of sets of variables for an equation that may improve understanding of a social process are illustrated. (MV)

This study examines differences in the labor supply of married women to part-time and full-time occupations, concluding that there are major differences in the determinants of labor supply for married women in part-time as opposed to full-time occupations. (HD)

This paper addresses the first year of a three-year, longitudinal study which introduces mathematical modeling to young children and provides professional development for their teachers. Four classes of third-graders (8 years of age) and their teachers participated in the first year of the program, which involved several preliminary modeling…

Traditional word problems have not fulfilled the goal of mathematical sense-making for many students. Some studies have shown that authentic contexts, such as model-eliciting tasks, have the potential to engage students in making sense of realistic situations. However, there has been little research on the kinds of knowledge needed by teachers to…

This paper focuses on clustering a World Wide Web site (i.e., the 1998 World Cup Soccer site) into groups of documents that are predictive of future user accesses. Two approaches were developed and tested. The first approach uses semantic information inherent in the documents to facilitate the clustering process. User access history is then used…

This volume and its companion, "Part 2," bring together transactions of the Rasch measurement special interest group of the American Educational Research Association. This volume opens with a discussion of the early years in Rasch measurement and then presents the "transactions" in chronological order, from a 1987 discussion…

This volume and its companion, "Part 1," bring together transactions of the Rasch measurement special interest group of the American Educational Research Association. It presents "transactions" in chronological order, from a 1992 discussion through the winter 1995 volume. Four issues of the "Transactions" are…

A mathematical model, using the vector maximization technique, is developed to study the underlying structure of a set of cost/benefit alternatives. (Author)

The validity of various reliability-corrected procedures for adjusting for initial differences between groups in uncontrolled studies is established for subjects exhibiting linear fan-spread growth. The results are then extended to a nonlinear model of growth. (Author)

One application of modeling is studying the ways in which molecules fit together to form chemical compounds. Describes the forces acting between molecules and how three-dimensional graphical modeling is employed in developing rational principles for drug design. (JN)