Network meta-analysis (NMA) incorporates all available evidence into a general statistical framework for comparing multiple treatments. Standard NMAs make three major assumptions, namely homogeneity, similarity, and consistency, and violating these assumptions threatens an NMA's validity. In this article, we suggest a graphical approach to…

The purpose of this study is to study the performance of different methods (inverse probability weighting and estimation of informative bounds) to control for differential attrition by comparing the results of different methods using two datasets: an original dataset from Portland Public Schools (PPS) subject to high rates of differential…

This brief considers the problem of using value-added scores to compare teachers who work in different schools. The author focuses on whether such comparisons can be regarded as fair, or, in statistical language, "unbiased." An unbiased measure does not systematically favor teachers because of the backgrounds of the students they are…

Using simulated and real data, this study compares the performance of three methodologies for assessing unidimensionality: (1) DIMTEST; (2) the approach of Holland and Rosenbaum; and (3) nonlinear factor analysis. All three models correctly confirm unidimensionality, but they differ in their ability to detect the lack of unidimensionality.…

This study was designed to explore one method of intervening in the process of a conventional academic classroom to affect student attitude and improve the learning climate. Two college freshman composition classes of 22 students each provided the subjects for the study. Each class was taught by the same instructor for three hours a week; one…

Global economic transformations have never been as dramatic as in the twentieth century. Most countries have experienced radical changes in the standards of income per capita, technology, fertility, mortality, income inequality and the extent of democracy in the course of the past century. It is the goal of many disciplines--economics, history,…

Item response theory bias detection procedures were applied to data from Black and White seniors on the High School and Beyond data files. Overall, the sums-of-squares statistics (weighted by the inverse of the variance errors) were the best indices for quantifying item characteristic curve differences between groups (Author/BW)

The No Child Left Behind Act has brought great attention to the high school graduation rate as one of the mandatory accountability measures for public school systems. However, there is no consensus on how to calculate the high school graduation rate given the lack of longitudinal databases that track individual students. This study reviews…

Since educational statistics, which are relatively easy to obtain, can only attempt to measure "quality," this paper asks how quality in higher education is assessed and how educational rankings, which are defined as benchmarks or attempts to measure, contribute to this process. The paper notes that while attempts to rank institutions of…

The Quality Measurement Project was established in 1956 by the New York State Education Department to determine the feasibility of measuring quality differences between schools and of identifying variables related to these differences. In the latest revision of the project, begun in 1964, 99 representative school systems, excluding the New York…