Examines factors to consider when selecting materials to be digitized: copyrights; intellectual nature of the source materials; current and potential users; actual and anticipated nature of use; format and nature of the digital product; describing, delivering, and retaining the digital product; relationships to other digital efforts; and costs and…

This article describes Cryptography, defined as the science of encrypting and deciphering messages written in secret codes, it has played a vital role in securing information since ancient times. There are several cryptographic techniques and many make extensive use of mathematics to secure information. The author discusses an activity built…

In recent years the Graduate Record Examinations (GRE) files have become recognized as a valuable resource for studies of talent flow, but the length and complexity of the files have made it costly to extract the information. A special GRE talent flow database was designed, covering the years 1978 to 1987, with three different structures: (1) an…

The Matrix of Community-Based Initiatives indicates in graph format the collocations of major public and private comprehensive community-based violence prevention and economic development initiatives that could assist in delinquency prevention efforts across the country. These initiatives, which are guided by varying goals, differ in the scope of…

The use of stepwise regression has been criticized for both interpretive misunderstandings and statistical aberrations. A major statistical problem with stepwise regression and other procedures that involve multiple significance tests is the inflation of the Type I error rate. General approaches to control the family-wise error rate such as the…

This paper illustrates the transformation of a raw data matrix into a matrix of associations, and then into a factor matrix. Factor analysis attempts to distill the most important relationships among a set of variables, thereby permitting some theoretical simplification. In this heuristic data, a correlation matrix was derived to display…

Order Analysis is a multidimensional scaling (MDS) technique for determining order among items. This paper reviews articles by different authors describing various components of ordering theory. A common nomenclature is constructed to link together the various ideas and is applied to a fairly simple set of data. Topics discussed include a more…

The major purposes of this guide are to: (1) identify available national data on maternal and child health, with emphasis on costs of care and insurance coverage for chronically ill children; (2) explain to the reader how to use such data; and (3) offer recommendations for improving future collection and analysis of national data. The guide is…

This document is designed to provide a concise introduction to the theory of generalized inverses of matrices that is accessible to undergraduate mathematics majors. The approach used is to: (1) develop the material in terms of full-rank factorizations and to relegate all discussions using eigenvalues and eigenvectors to exercises, and (2) include…

Strategies for implementing instructional improvement programs must consider institutional characteristics, needs assessment, program and organizational objectives, and the characteristics of the instructional improvement program. Checklists, tables, and matrices are presented to illustrate the cyclical nature of the process of program development…

A model for long-range institutional planning is presented that is based on the integration of institutional elements and functions: overall mission, quantitative goals, responsibilities, activities, and resources. A comprehensive model must also include evaluation and organization in the planning process. Each of the institutional functions and…

Despite advances in common factor analysis, a review of 89 studies published in four selected journals between 1963 and 1976 indicated that behavioral scientists preferred principal components analysis, followed by varimax or orthogonal rotation. Resultant row sums of squares of factor matrices from principal component analyses of real data sets…

Two experiments which investigated the young child's ability to deal with multiplicative classes and relations (considered behavioral indices of concrete operations thought) in double series and cross class matrices are described and discussed. In the initial study, 160 children from preschool through grade 2 received six matrix subtasks…

This paper is an extended series of appendices to the report "Exploring the T.R.Q.: An Assessment of the Effectiveness of the Teachers' Rating Questionnaire," Report Number 123. It should be most useful to those familiar with multiple regression analysis and factor analysis and wishing a more complex record of the statistical procedures…

Results of 25 empirical student demand studies are standardized and analyzed using meta-analytic methods. Results show that higher prices reduce higher education enrollments, and students historically have been more responsive to tuition prices than to (offsetting) student aid. (Author/MLW)