Decomposable models, which allow for the interdependence of structure among observable variables, are described. Each model is fully characterized by a set of conditional interdependence restrictions and can be visualized with an undirected as well as a special type of directed graph. (Author/JKS)

Describes a Fortran program that illustrates how the end-to-end distances in randomly coiled polymer molecules is affected by varying the number and lengths of chains and the angles between them. (MLH)

A more generalized error model for time-limit tests is developed. Model estimates are derived for right-attempted and wrong-attempted correlations both within the same test and between different tests. A comparison is made between observed correlations and their model counterparts and a fair agreement is found between observed and expected…

Possibilities of using regression techniques for predicting, evaluating, and controlling the performance of bibliographic search procedures are explored. "Least time" search sequences for bibliographic searching are determined. (Author)

Geometric models are used to study numerical relationships in summation formulas. (DT)

While it is imperative that attempts be made to assess the predictive accuracy of any prediction model, traditional measures of predictive accuracy have been criticized as suffering from "the base rate problem." The base rate refers to the relative frequency of occurrence of the event being studied in the population of interest, and the…

Annual funds face pressures to contact all alumni to maximize participation, but these efforts are costly. This paper uses a logistic regression model to predict likely donors among alumni from the College of Arts & Humanities at the University of Maryland, College Park. Alumni were grouped according to their predicted probability of donating…

Argues for increased usage of non-linear regression models which could account for a greater percentage of the variance in the data than do linear models in educational studies. (JP)

Some related mathematical models are presented of the bargaining process between an employer, or a group of employers, and a labor union. Its novelty is in the formulation and use of "reactive functions" to explain the attitudes of the respective parties at each stage of the negotiation process and its consequent time-path. (Author)

Attempts to draw together the kinds of information needed to help school district administrators view their orgnization by examining the consequences of decisions for all of the district goals and objectives, rather than by solving problems one at a time. (Author)

Paper presents an example of the use of the linear model for attitude measurement emphasizing the validation of the regression weights by comparing them with traditional and more direct measures of attitude. (Author)

Perspective on article by P. Isaac published in the Psychological Bulletin, 1970, 74, 213-18. (CB)

In the geometrical construct of the MANOVA, the dimensions of interest are primarily those of the significant canonical variates, rather than either those of the original n variables or even the total possible canonical variates. (Authors)

Article discusses the five units of the metric system that are most important for elementary school teachers. (GB)

The probabilities of certain English football teams winning different playoffs are determined. In each case, a mathematical model is fitted to the observed data, assumptions are verified, and the calculations performed. (LS)