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Direct linkChou, Yeh-Tai; Wang, Wen-Chung – Educational and Psychological Measurement, 2010
Dimensionality is an important assumption in item response theory (IRT). Principal component analysis on standardized residuals has been used to check dimensionality, especially under the family of Rasch models. It has been suggested that an eigenvalue greater than 1.5 for the first eigenvalue signifies a violation of unidimensionality when there…
Descriptors: Test Length, Sample Size, Correlation, Item Response Theory
