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50 Years of ERIC
50 Years of ERIC
The Education Resources Information Center (ERIC) is celebrating its 50th Birthday! First opened on May 15th, 1964 ERIC continues the long tradition of ongoing innovation and enhancement.

Learn more about the history of ERIC here. PDF icon

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A Comparison of the Approaches of Generalizability Theory and Item Response Theory in Estimating the Reliability of Test Scores for Testlet-Composed Tests
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Lee, Guemin; Park, In-Yong – Asia Pacific Education Review, 2012
Previous assessments of the reliability of test scores for testlet-composed tests have indicated that item-based estimation methods overestimate reliability. This study was designed to address issues related to the extent to which item-based estimation methods overestimate the reliability of test scores composed of testlets and to compare several…
Descriptors: Generalizability Theory, Simulation, Computation, Item Response Theory
Estimating Reliability of School-Level Scores Using Multilevel and Generalizability Theory Models
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Jeon, Min-Jeong; Lee, Guemin; Hwang, Jeong-Won; Kang, Sang-Jin – Asia Pacific Education Review, 2009
The purpose of this study was to investigate the methods of estimating the reliability of school-level scores using generalizability theory and multilevel models. Two approaches, "student within schools" and "students within schools and subject areas," were conceptualized and implemented in this study. Four methods resulting from the combination…
Descriptors: Generalizability Theory, Scores, Reliability, Statistical Analysis
A New Approach to Test Score Equating Using Item Response Theory with Fixed C-Parameters
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Lee, Guemin; Fitzpatrick, Anne R. – Asia Pacific Education Review, 2008
Because parameter estimates from different calibration runs under the IRT model are linearly related, a linear equation can convert IRT parameter estimates onto another scale metric without changing the probability of a correct response (Kolen & Brennan, 1995, 2004). This study was designed to explore a new approach to finding a linear equation by…
Descriptors: Equated Scores, Item Response Theory, Models, Equations (Mathematics)