The Urry Method of Approximating The Item Parameters of Latent Trait Theory.

Schmidt, Frank L.

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Peer reviewed

ERIC Number: EJ174776

Record Type: Journal

Publication Date: 1977

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The Urry Method of Approximating The Item Parameters of Latent Trait Theory

Schmidt, Frank L.

Educational and Psychological Measurement, 37, 3, 613-20, Aut 77

Urry's procedure for approximating latent trait test models is shown to tend to underestimate item discriminatory power and overestimate item difficulty. A method for correcting these biases is provided, and implications of the procedures are discussed. (Author/JKS)

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

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