Differential item functioning (DIF) continues to receive attention both in applied and methodological studies. Because DIF can be an indicator of irrelevant variance that can influence test scores, continuing to evaluate and improve the accuracy of detection methods is an essential step in gathering score validity evidence. Methods for detecting…

Analysis of covariance (ANCOVA) has been recommended as one vehicle with which to evaluate special education and other intervention impacts (M. J. Taylor and M. S. Innocenti, 1993). Common misinterpretations of this methodology for these purposes are explained. These misapplications of ANCOVA include: (1) ignoring the assumption of homogeneity of…

This study examines the predictability of Graduate Record Examinations (GRE) reading item difficulty (equated delta) for the three major reading item types: main idea, inference, and explicit statement items. Each item type is analyzed separately, using 110 GRE reading passages and their associated 244 reading items; selective analyses of 285…

This paper presents findings of a study that examined the role of social networks in promoting or inhibiting student achievement. The study was based on the convoy model--a "convoy" is a dynamic, hierarchical structure of social relations that provide the individual with a supportive base from which to develop personal competencies. The premise of…

Studies evaluating hypotheses about sources of differential item functioning (DIF) are classified into two categories: observational studies evaluating operational items and randomized DIF studies evaluating specially constructed items. For observational studies, advice is given for item classification, sample selection, the matching criterion,…

Education is a key for the economic growth and social development of developing countries. This paper presents findings of a study that analyzed how scarce resources should be allocated to the two types of secondary education--academic and vocational. Methodology involved correlation and regression analysis of World Bank data on the Gross National…

Operational procedures for the Graduate Record Examinations Validity Study Service are reviewed, with emphasis on the problem of frequent occurrence of negative coefficients in the fitted within-department regressions obtained by the empirical Bayes method of H. I. Braun and D. Jones (1985). Several alterations of the operational procedures are…

If an effective school is defined as a school that causes student improvement on a number of important educational outcomes, the problem of identifying effective schools becomes one of establishing legitimate predictions of student performance and comparing those predictions to actual student or school outcomes. In attempting to identify effective…

By the late 1980s, fiscal crises, tax revolt measures, education reform, and other factors had prompted 28 states to institute state lotteries as a supplemental means of public finance. This paper presents findings of a study that examined whether or not lotteries enhance public education spending. Data for 1987 from all 50 states were compared…

An overview is given of the available statistical theory and software for analyzing hierarchically nested data. Programs are evaluated, and general techniques are proposed to analyze data from several domains. This research is part of a larger project to evaluate elementary education in the Netherlands. The models discussed are the random…

A study investigated the relationship between television program type preference and program choice in a multichannel situation. Program type categories were constructed which tapped in the program type distinction mentally represented in viewers' minds and a more elaborate measure of program choice options was developed. A total of 442…

P. O. Johnson and J. Neyman (1936) proposed a general linear hypothesis testing procedure for testing the null hypothesis of no treatment difference in the presence of some covariates. This is generally known as the Johnson-Neyman (JN) technique. The need for the hypothesis testing step (often omitted) as originally presented and the…

The wide availability of large amounts of inexpensive computing power has encouraged statisticians to explore many approaches to a basis for inference. This paper presents one such "computer-intensive" approach: the bootstrap of Bradley Efron. This methodology fits between the cases where it is assumed that the form of the distribution…

In an article published in the spring 2003 issue of "Harvard Educational Review", Roy Freedle stated that the SAT® is both culturally and statistically biased. Freedle proposed a solution to this bias, which involved using a half-test made up of the most difficult items culled from complete SAT examination. His claims, which garnered…

Three statistical techniques--conjoint analysis, a multiple linear regression model, and a multiple linear regression model with a surrogate person variable--were used to estimate the relative importance of five university attributes for students in the process of selecting a college. The five attributes include: availability and variety of…