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Peer reviewedBeaton, Albert E.; Johnson, Eugene G. – Journal of Educational Measurement, 1992
The National Assessment of Educational Progress (NAEP) uses item response theory (IRT) based scaling methods to summarize information in complex data sets. The necessity of global scores or more detailed subscores, creation of developmental scales for different ages, and use of scale anchoring for scale interpretation are discussed. (SLD)
Descriptors: Age Differences, Educational Assessment, Elementary Secondary Education, Evaluation Methods
Peer reviewedBecker, Douglas F.; Forsyth, Robert A. – Journal of Educational Measurement, 1992
Measurement scales developed using Thurstone and item-response theory (IRT) methods of scaling achievement tests for the same single-level data were compared for approximately 4,000 high school students taking the Iowa Tests of Educational Development in 1975. Results of both approaches indicate that variability increases as grade level increases.…
Descriptors: Achievement Tests, Age Differences, High School Students, High Schools
