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Download full textChang, S. Tai; Bashaw, W. L. – 1984
The purpose of this study was twofold: to investigate to what extent characteristics of anchor tests may affect precision of item calibration, and to estimate to what extent precision of item calibration may be affected by removal of persons whose response patterns deviate from those normally expected from the Rasch one-parameter logistic model.…
Descriptors: Aptitude Tests, Difficulty Level, Equated Scores, Junior High Schools
