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Peer reviewedPhillips, S. E.; Mehrens, William A. – Journal of Educational Measurement, 1987
This study investigates whether a linear factor analytic method commonly used to evaluate violation of the item response theory (IRT) unidimensionality assumption is sensitive to measurable curricular differences within a school district and to examine the possibility of differential item performance for groups of students receiving different…
Descriptors: Achievement Tests, Elementary Education, Elementary School Curriculum, Factor Analysis
