Maintaining Instrument Quality while Reducing Items: Application of Rasch Analysis to a Self-Report of Visual Function.

Velozzo, Craig A.; Lai, Jin-Shei; Mallinson, Trudy; Hauselman, Ellyn

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Peer reviewed

ERIC Number: EJ627394

Record Type: Journal

Publication Date: 2001

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ISSN: ISSN-1090-655X

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Maintaining Instrument Quality while Reducing Items: Application of Rasch Analysis to a Self-Report of Visual Function.

Velozzo, Craig A.; Lai, Jin-Shei; Mallinson, Trudy; Hauselman, Ellyn

Journal of Outcome Measurement, v4 n3 p667-80 2000-2001

Studied how Rasch analysis could be used to reduce the number of items in an instrument while maintaining credible psychometric properties. Applied the approach to the Visual Function-14 developed to measure the need for and outcomes of cataract surgery. Results show how Rasch analysis can be useful in designing modifications of instruments. (SLD)

Descriptors: Item Response Theory, Psychometrics, Test Construction, Test Items, Visual Impairments

Publication Type: Journal Articles; Reports - Evaluative

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Audience: N/A

Language: English

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