Tree representations of similarity data are investigated. Hierarchical clustering is critically examined, and a more general procedure, called the additive tree, is presented. The additive tree representation is then compared to multidimensional scaling. (Author/JKS)

The function of a statistical map is to provide readers with a visual impression of the data so that they may be able to identify any geographic characteristics of the displayed phenomena. The increasingly important role played by the computer in the production of statistical maps is manifested by the varied examples of computer maps in recent…

Previous users of Coursewriter, an interactive computer-based learning system, experienced difficulty retrieving student progress reports. A program has been written which will permit the person in charge of the course to request student reports, test scores, connect time, and class statistics. Sample program interactions and a copy of the program…

A Monte Carlo study investigated the ability of the ALSCAL multidimensional scaling program to recover true structure inherent in simulated proximity measures when data were missing. The program worked well with up to 60 percent missing data as long as sample size was large and random error was low. (Author/JKS)

Several advantages to the use of different kinds of factor scores as independent variables in a multiple regression equation are reported. A computer program is presented which will calculate a regression equation using a variety of factor scores. (Author/JKS)

Two computer programs (one batch, one interactive) are designed to provide statistics for a weighted linear combination of several component variables. Both programs provide mean, variance, standard deviation, and a validity coefficient. (Author/JKS)

The procedures used to produce the index to volume 20 (1969) of American Documentation are described to demonstrate a system for computer-assisted indexing and bibliographic production developed at the Columbia University School of Library Science. The system is demonstrated to be economic in comparison to currently used manual methods. (Author/MF)

The aims of the first phase of the Statistics Indexing and Retrieval (STIR) Project have been: (1) to define the types and sources of statistics which should be within the scope of an operational indexing system for statistical sources; (2) to analyze the use made of statistical sources; and (3) to consider the intellectual, structural, and…

A union catalog of 1,100,000 books on computer output microfiche (COM) in twenty-one Louisiana libraries is described. The computer programs, the data bank, and output are described. Also described are the statistical tabulations which are a by-product of the system and which provide a rich source for analysis. (8 references) (Author)

As a result of a survey made to identify and classify the emergency repairs being made in the Memphis Public Schools, an "Emergency Repair Manual" was developed to provide the basic guidelines and information required to obtain maximum benefits from 2-way radio with select call and paging provisions. Each emergency is coded on the…

An algorithm for updating the means of variances of a norm group after each computer-assisted administration of a test is described. The algorithm does not require storage of the whole data set, and provides for unlimited, continuous expansion of the test norms. (Author)

A study was undertaken to develop guidelines for the interpretation of the parameters of three multidimensional item response theory models and to determine the relationship between the parameters and traditional concepts of item difficulty and discrimination. The three models considered were multidimensional extensions of the one-, two-, and…

The statistical methods presented in this workbook focus on the display of central tendency, statistical tests, and correlation. Chapters 2, 3, and 4 consist of worksheets, each of which provides step-by-step instructions for calculating and interpreting a particular statistical method. The introduction to each worksheet explains how and when to…

This publication discusses the difficulties of calculating reliable income estimates for particular groups of people and presents a methodology for overcoming those obstacles. Basically, the procedure involves setting up cumulative distributions of housing values, rental values, and family incomes for each census tract. Average housing values and…

Adequate recordkeeping in medical libraries provides useful guidelines for collection management, acquisitions, cataloging, circulation, planning, and administration. Computerized recordkeeping is also discussed, as well as the characteristics of library users and library use patterns. There are extensive references. (LS)