Conditional Versus Unconditional Procedures for Sample-Free Item Analysis.

Wright, Benjamin D.; Douglas, Graham A.

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Peer reviewed

ERIC Number: EJ174773

Record Type: Journal

Publication Date: 1977

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Conditional Versus Unconditional Procedures for Sample-Free Item Analysis

Wright, Benjamin D.; Douglas, Graham A.

Educational and Psychological Measurement, 37, 3, 573-86, Aut 77

Two procedures for Rasch, sample-free item calibration are reviewed and compared for accuracy. The theoretically ideal "conditional" procedure is impractical for more than fifteen items. The more practical but biased "unconditional" procedure is discussed in detail. (Author/JKS)

Descriptors: Comparative Analysis, Item Analysis, Latent Trait Theory, Mathematical Models, Measurement, Test Bias, Test Construction

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