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ERIC Number: EJ889071
Record Type: Journal
Publication Date: 2010
Pages: 5
Abstractor: ERIC
Reference Count: 6
ISSN: ISSN-0146-6216
Sensitivity of Equated Aggregate Scores to the Treatment of Misbehaving Common Items
Michaelides, Michalis P.
Applied Psychological Measurement, v34 n5 p365-369 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 discarded from the common item pool, using real data from large-scale assessment programs from three states. (Contains 2 tables and 1 figure.)
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Publication Type: Journal Articles; Reports - Descriptive
Education Level: Grade 11; Grade 6; Grade 8
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A