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Direct linkSweeney, Sandra M.; Sinharay, Sandip; Johnson, Matthew S.; Steinhauer, Eric W. – Educational Measurement: Issues and Practice, 2022
The focus of this paper is on the empirical relationship between item difficulty and item discrimination. Two studies--an empirical investigation and a simulation study--were conducted to examine the association between item difficulty and item discrimination under classical test theory and item response theory (IRT), and the effects of the…
Descriptors: Correlation, Item Response Theory, Item Analysis, Difficulty Level
Download full textHaberman, Shelby J.; Sinharay, Sandip; Lee, Yi-Hsuan – Educational Testing Service, 2011
Providing information to test takers and test score users about the abilities of test takers at different score levels has been a persistent problem in educational and psychological measurement (Carroll, 1993). Scale anchoring (Beaton & Allen, 1992), a technique that describes what students at different points on a score scale know and can do,…
Descriptors: Statistical Analysis, Scores, Regression (Statistics), Item Response Theory
Sinharay, Sandip; Holland, Paul W. – Educational Testing Service, 2008
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…
Descriptors: Equated Scores, Test Items, Item Response Theory, Data
Sinharay, Sandip; Holland, Paul – ETS Research Report Series, 2006
It is a widely held belief that an anchor test used in equating should be a miniature version (or "minitest") of the tests to be equated; that is, the anchor test should be proportionally representative of the two tests in content and statistical characteristics. This paper examines the scientific foundation of this belief, especially…
Descriptors: Test Items, Equated Scores, Correlation, Tests
