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Li, Feifei – ETS Research Report Series, 2017
An information-correction method for testlet-based tests is introduced. This method takes advantage of both generalizability theory (GT) and item response theory (IRT). The measurement error for the examinee proficiency parameter is often underestimated when a unidimensional conditional-independence IRT model is specified for a testlet dataset. By…
Descriptors: Item Response Theory, Generalizability Theory, Tests, Error of Measurement
Teker, Gulsen Tasdelen; Dogan, Nuri – Educational Sciences: Theory and Practice, 2015
Reliability and differential item functioning (DIF) analyses were conducted on testlets displaying local item dependence in this study. The data set employed in the research was obtained from the answers given by 1,500 students to the 20 items included in six testlets given in English Proficiency Exam by the School of Foreign Languages of a state…
Descriptors: Foreign Countries, Test Items, Test Bias, Item Response Theory
Wren, David; Barbera, Jack – Chemistry Education Research and Practice, 2014
Assessing conceptual understanding of foundational topics before instruction on higher-order concepts can provide chemical educators with information to aid instructional design. This study provides an instrument that can be used to identify students' alternative conceptions regarding thermochemistry concepts. The Thermochemistry Concept Inventory…
Descriptors: Psychometrics, Thermodynamics, Chemistry, Item Response Theory
Moses, Tim; Kim, Sooyeon – ETS Research Report Series, 2007
This study evaluated the impact of unequal reliability on test equating methods in the nonequivalent groups with anchor test (NEAT) design. Classical true score-based models were compared in terms of their assumptions about how reliability impacts test scores. These models were related to treatment of population ability differences by different…
Descriptors: Reliability, Equated Scores, Test Items, Statistical Analysis
Cope, Ronald T. – 1987
This study used generalizability theory and other statistical concepts to assess the application of the Angoff method to setting cutoff scores on two professional certification tests. A panel of ten judges gave pre- and post-feedback Angoff probability ratings of items of two forms of a professional certification test, and another panel of nine…
Descriptors: Certification, Correlation, Cutting Scores, Error of Measurement