This study compared the accuracies of four differential item functioning (DIF) estimation methods, where each method makes use of only one of the following: raw data, logistic regression, loglinear models, or kernel smoothing. The major focus was on the estimation strategies' potential for estimating score-level, conditional DIF. A secondary focus…

District-level policymakers are challenged to use evidence of student achievement to make policy decisions, such as professional development and other school improvement plans. They currently receive reports of student achievement data that are complex, difficult to read, and even harder to interpret. Using the research literature on policymakers'…

The Test of English as a Foreign Language[TM], better known as TOEFL[R], is designed to measure the English-language proficiency of people whose native language is not English. TOEFL scores are accepted by more than 6,000 colleges, universities, and licensing agencies in 130 countries. The test is also used by governments, and scholarship and…

The nonequivalent groups with anchor test (NEAT) design involves missing data that are missing by design. Three popular equating methods that can be used with a NEAT design are the poststratification equating method, the chain equipercentile equating method, and the item-response-theory observed-score-equating method. These three methods each…

Innovations, ETS's corporate magazine, provides information on educational assessment for educators, school leaders, researchers and policymakers around the world. Each issue of Innovations focuses on a particular theme in assessment. This issue reports on how new technologies in classrooms around the world are enhancing teaching, learning and…