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Download full textEvans, John Andrew; Ackerman, Terry – 1994
The strengths of item-response theory (IRT) are used to examine the degree of information individual test items provide, as well as to investigate how the individual item types contribute to the overall measurement accuracy of the Illinois Goal Assessment Program (IGAP) reading test. Using the graded-response model of Samejima (1969), the amount…
Descriptors: Ability, Educational Diagnosis, Elementary Education, Elementary School Students
Bolt, Daniel; Ackerman, Terry – 1994
The 1993 Illinois Goal Assessment Program (IGAP) Reading Tests measured reading comprehension using both narrative and expository reading passages. Noticeable differences in mean scaled scores occurred depending on whether the 1993 results were equated back to the 1992 narrative test or the 1993 expository test (Hsu and Ackerman, 1994). In an…
Descriptors: Achievement, Context Effect, Correlation, Educational Objectives
