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Direct linkMichaelides, Michalis P. – Applied Psychological Measurement, 2010
The delta-plot method (Angoff, 1972) is a graphical technique used in the context of test equating for identifying common items with aberrant changes in their item difficulties across administrations or alternate forms. This brief research report explores the effects on equated aggregate scores when delta-plot outliers are either retained in or…
Descriptors: Test Items, Behavior Problems, Measurement, Mathematics Instruction
