Coefficient Alpha as an Estimate of Test Reliability under Violation of Two Assumptions.

Zimmerman, Donald W.; And Others

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Peer reviewed

ERIC Number: EJ463391

Record Type: Journal

Publication Date: 1993

Pages: N/A

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ISSN: ISSN-0013-1644

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Coefficient Alpha as an Estimate of Test Reliability under Violation of Two Assumptions.

Zimmerman, Donald W.; And Others

Educational and Psychological Measurement, v53 n1 p33-49 Spr 1993

Coefficient alpha was examined through computer simulation as an estimate of test reliability under violation of two assumptions. Coefficient alpha underestimated reliability under violation of the assumption of essential tau-equivalence of subtest scores and overestimated it under violation of the assumption of uncorrelated subtest error scores. (SLD)

Descriptors: Computer Simulation, Estimation (Mathematics), Mathematical Models, Robustness (Statistics), Scores, Statistical Bias, Test Reliability

Publication Type: Reports - Evaluative; Journal Articles

Education Level: N/A

Audience: N/A

Language: English

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Author Affiliations: N/A