The purpose of this paper is to examine the validity of regression estimates when skewed dichotomous scales are used as independent variables. When Pearson product-moment correlations are used to measure zero-order associations involving dichotomous variables, the resulting coefficients underestimate the true associations. As a result, using…

The use of planned, or "a priori," and unplanned, or "post hoc," comparisons to isolate differences among means in analysis of variance research is discussed. Planned comparisons typically involve weighting data by sets of "contrasts." Planned comparison offer more power against Type II errors. In addition, they force…

Presents a method for determining the number of days on which questions must be counted in order to achieve a given precision and confidence in reference statistics. (Author/PF)

This paper reviews studies from twelve less-industrialized countries on the relationship between textbook availability and academic achievement. The studies included a variety of measures, methodologies, and reporting procedures and focused on different achievement indicators, for example, math, science, reading, and language. The paper points out…

This annotated bibliography covers studies, surveys, and statistical data relating to college trained manpower. It serves to make known the scope of these source materials as a service to those engaged in placement and recruitment. All the materials contained herein were published from 1960-1966. The material is listed according to subject…

This volume is the second part of a Report of the Survey Committee of the Conference Board of the Mathematical Sciences, and presents data on a number of specific conditions and problems regarding the broad subject of graduate education in the mathematical sciences. Volume I, ASPECTS OF UNDERGRADUATE TRAINING IN THE MATHEMATICAL SCIENCES,…

This report is a statistical study of juvenile court cases in 1972. The data demonstrates how the court is frequently utilized in dealing with juvenile delinquency by the police as well as by other community agencies and parents. Excluded from this report are the ordinary traffic cases handled by juvenile court. The data indicate that: (1) in…

In periods of rising costs and changing economic conditions, school administrators are faced with difficult problems in projecting school budgets, estimating probable cost increases, and determining salary needs of school personnel. The Bureau of Labor Statistics of the U.S. Department of Labor offers information that can be of value to school…

A previously relatively unexplored area of theater history studies is the quantification of titles, authors, and locations of productions of plays in Canada and the United States. Little is known, for example, about the number of times any one play was staged, especially in the earlier days of American drama. A project which counts productions on…

The data presented in this report call attention to inappropriate use of the Eigenroot criterion in factor work, a practice which has probably grown out of a theoretical focus on determining basic laws of behavior, rather than a practical emphasis on providing information that will be useful to college instructors and administrators. When…

It is demonstrated here that standardized regression coefficients greater than one can legitimately occur. Furthermore, the relationship between the occurrence of such coefficients and the extent of multicollinearity present among the set of predictor variables in an equation is examined. Comments on the interpretation of these coefficients are…

Principal component analysis, image component analysis, and maximum likelihood factor analysis were compared to assess the effects of variable sampling. Results with respect to degree of saturation and average number of variables per factor were clear and dramatic. Differential effects on boundary cases and nonconvergence problems were also found.…

This response to the Baglin paper (1986) points out the fallacy in inferring that inappropriate scaling procedures cause apparent discrepancies between medians and means and between means calculated using different units. (LMO)

This article reviews some of the properties of criterion-scaled regression analysis, especially as it relates to the analysis of a repeated measures/randomized block design. (Author/LMO)

Three exact probability tests, counterparts of t tests for single sample, independent samples, and dependent samples, are described for data obtained from ratings on "m" scales by a single rater or on a single scale by "n" raters. (LMO)