The Generalized Inverse Gaussian-Poisson Distribution is suggested as an all-embracing mathematical model for bibliometric frequency distributions. Twelve examples are given which show that the new model cannot be rejected by virtue of an objective chi-squared test. A mathematical appendix and 20 references are included. (Author/EJS)

An example shows how a group of professionals and citizens can select a feasible site for a facility by rank ordering criteria of availability, population, accessibility, and cost. (MLF)

Investigates the properties of a global model consisting of "n" local information retrieval systems based on thesaurus. Definitions of a distributed information retrieval system (thesaurus, documents set, set of queries) and proofs of theorems denoting further properties of the systems are highlighted. Five references are included. (EJS)

Latent trait and latent class analyses of Likert-type data are compared. Key similarities and differences between these methods are described and illustrated by applying a latent trait model and a latent class model to the analysis of a set of "life satisfaction" data. (Author/NSF)

Describes the instructional strategies and activities used to illustrate the essential features of mathematical modeling to a group of infant and junior high school teachers. The intent was to involve the group with some number work, elementary algebra, and some simple work on arrangements by way of tree-diagrams. (JN)

The Rasch latent trait model was applied to investigate the relationship of performance on Raven items to expectations for individuals at different levels of the underlying scale. The use of Rasch model in instances of small samples and issues related to the interpretation of the model to Raven-type data are discussed. (DWH)

Describes a course designed to assist students in writing differential equations to represent chemical processes and to solve these problems on digital computers. Course outline and discussion of computer projects and the simulation and optimization of a continuously stirred tank reactor process are included. (JN)

Equity impacts of school finance reform in South Carolina are studied with the aid of 15 different measures of equity. Results indicate considerable equity improvements in the state from 1978 to 1982. (Author/MLF)

Statistical methods, called latent variable models, have been developed to provide rigorous tests of theories involving unobserved variables. This paper describes the major types of latent variable models, shows how they can be applied in educational research, and gives representative examples of their use from the literature. (Author/BW)

Develops and tests a mathematical model that estimates the impact of home video recorders on the transience of television broadcasts. Concludes that home video recorder use has the potential to affect program longevity, but that the potential remains unfulfilled. (PD)

Describes the construction and use of cardboard models that illustrate systems that are functions of three variables. (MLH)

Concerned with consequences of employing the INDSCAL model when one of its assumptions are known to be violated. Under study is the notion that all individuals perceive the object space dimensions to be independent. (RC)

This article suggests some criteria to consider when using a concrete representation to support the treatment of a mathematical concept or sentence. (DT)

Learning processes have been investigated for regularities of the changes in the strength of a reflex that result from manipulations of several parameters of a stimulus. Most of this work has been carried out in the tradition of associative theory. One consequence of this emphasis was that for a long time several phenomena that can be…

We explore the nature and consequences of teachers' problem solving through an example of a teacher's mathematical problem solving as it was occasioned by a student's mathematics. This illustration demonstrates the value of an interpretive framework that points to the mathematics of the classroom as a collective. Arising from this exploration is…