A study investigated the use of a mathematical model to predict individuals' total active Hebrew vocabulary from samples of their written and spoken language. The model is based on a generalized inverse Gaussian distribution. The subjects were Israeli junior high school students from both high and low socioeconomic groups. Hebrew language samples…

This report outlines the activities of the Center for Agricultural and Rural Development (CARD), Iowa State University, for the year ending June 30, 1986. Progress was made in expanding and enhancing the policy research program, which comprises four divisions. The natural resources and conservation program participated with the Soil Conservation…

The stability of Rasch test item difficulty parameters was investigated under varying conditions. Data were taken from a mathematics achievement test administered to over 2,000 Australian students. The experiments included: (1) relative stability of the Rasch, traditional, and z-item difficulty parameters using different sample sizes and designs;…

This paper discusses the use of the LISREL computer program to compare two groups of Ontario students who studied French as a second language in either a regular or an immersion program. Longitudinal data on growth in mathematical ability, from grade 4 to grade 6, are analyzed using seven different mathematical models. The paper illustrates the…

Birnbaum's three-parameter logistic item response model was used to study guessing behavior of low ability examinees on the Graduate Record Examinations (GRE) General Test, Verbal Measure. GRE scoring procedures had recently changed, from a scoring formula which corrected for guessing, to number-right scoring. The three-parameter theory was used…

The study examines the rule space model, a probabilistic model capable of measuring cognitive skill acquisition and of diagnosing erroneous rules of operation in a procedural domain. The model involves two important components: (1) determination of a set of bug distributions (bug density functions representing clusters around the rules); and (2)…

To improve the accuracy of college placement, Rasch scoring and person-fit statistics on the Comparative Guidance and Placement test (CGP) was compared to the traditional right-only scoring. Correlations were calculated between English and mathematics course grades and scores of 1,448 entering freshmen on the reading, writing, and mathematics…

A broad spectrum of methodologies pertinent to studies of schooling effects are reviewed. Methodological issues and problems are addressed according to a three-dimensional conceptual framework: (1) indicators of schooling effects; (2) study approaches; and (3) units of analysis. Problems and uses of status attainment and difference scores as…

A study was conducted by the Illinois Community College Board to assess the economic impact of the state's public community colleges upon their local service districts. As part of the study, financial information concerning local businesses, local governments, faculty, staff, and students at six representative institutions were examined to…

A procedure which employs a method of item substitution based on item difficulty is recommended for developing parallel criterion referenced test forms. This procedure is currently being used in the Florida functional literacy testing program and the Georgia teacher certification testing program. Reasons for developing parallel test forms involve…

Research sought to develop a quantitative model for the prediction of learning effects of a bilingual children's educational television program. The stimulus program series consisted of 30 sessions of Carrascolendas, a Spanish-English series which was based on specified behavioral objectives and aimed at students through grade 2. Learning effects…

The authors describe an extension that has been made to and subsequently incorporated into the system known as Teacher Cost Models. This approach -- a dollar flow analysis -- identifies and quantifies the factors that contribute to dollar changes in the ON GRID teacher wage-bill from one year to the next. The methodology is applicable at both the…

This university level course in economic geography emphasizes the need for control of the spatial allocation of our resources, and strives for heightened student awareness of the world as a complex. It may thus be considered an introduction to geocybernetics, the study of man/machine relationships in the control of spatial organization. A systems…

Nearly 150 papers presented at this conference, sponsored by the International Federation for Information Processing, are included in this volume which surveys the state of the art of computer education. Nine papers provide an overview on such topics as computer science and mathematics, computer education in the 1970's, computers and the…

The study applied the conventional linear transportation program to the student assignment problem and investigated methods of measuring the achieved level of desegregation. Existing measures of desegregation were analyzed, and two new indexes were developed for use in the present model and probably for other system analytical models designed to…