The jackknife by groups and modifications of the jackknife by groups are used to estimate standard errors of rotated factor loadings for selected populations in common factor model maximum likelihood factor analysis. Simulations are performed in which t-statistics based upon these jackknife estimates of the standard errors are computed.…

An integrated study of Shine's actualized and pure single-subject behavior functions can produce more information than studying only one function. After summarizing the mathematics behind Shine's viewpoint, an ordinary regression analysis approach to the actualized behavior function is integrated with a time-series analysis approach to the pure…

Four measures of influence in intercorporate networks are tested, using data from a sample of large American corporations in 1904. Comparison with historical accounts of the period indicate that modifications of the Bonacich index of a point's centrality in a network yield the most reliable results. (Author/RW)

Suggests that ordinal and ratio criteria for equity are independent of one another, but that a plausible mathematical definition of equity must satisfy both criteria under all outcome/input ratio situations. Demonstrates that a modification of the Harris linear formula for equity meets these criteria. (Author/RD)

Treatments of contextual effects in the social science literature have traditionally focused on statistical phenomena more than on social processes. This article seeks to redress that imbalance by focusing on underlying processes through which social structure and social interaction may impinge upon individuals. (Author/JKS)

The question of whether or not a certain mathematical model is applicable to the paired-associate data of preschool children as well as adults was examined in five experiments. (Author/MP)

A data analysis model called CANDELINC performs a broad range of multidimensional data analyses. The model allows for the incorporation of general linear constraints. Several examples are presented. (JKS)

Methods for teaching traditional college mathematics materials in the areas of analysis, vector algebra, etc., are reviewed. Examples of interesting and novel construction problems, logical decisions, generalizations with calculators, and other topics used in an experiment at a technical college in Budapest, Hungary are presented. (MP)

The application of Bezier polynomials in computer graphics to generate curves and surfaces is presented. The use of these curves to aid in the design of automobiles is featured, and a BASIC program designed to draw a simple caricature is included. (MP)

This study investigated the impact of four student characteristics and the instructors on the relative abilities of a simulation-gaming method and the lecture-discussion method to increase the economic knowledge, retention of economic knowledge, and interest toward economics of college students enrolled in an introductory economics course.…

Technical problems in achievement testing associated with using latent structure models to estimate the probability of guessing correct responses by examinees is studied; also the lack of problems associated with using Wilcox's formula score. Maximum likelihood estimates are derived which may be applied when items are hierarchically related.…

Results of 59 studies of this relationship were integrated. Analysis revealed a substantial relationship between class size and teacher and pupil attitudes, as well as instruction. The results complement those of a previous meta-analysis that showed positive effects of class size on achievement. (Author/GK)

This paper demonstrates the feasibility of using the penalty function method to estimate parameters that are subject to a set of functional constraints in covariance structure analysis. Both types of inequality and equality constraints are studied. The approaches of maximum likelihood and generalized least squares estimation are considered.…

Methods of formulating mathematical models are discussed and problems, insights, and solutions are given. (PK)

Discusses the purpose of mathematical models and reviews the phases of the modeling process--defining performance, representing the problem, predicting performance, estimating parameters, defining optimization criterion, determining solution, and implementing results. Reviews of book-use, resource allocation, and library network models are…