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Comparing the Reliability of Difference Scores and Residuals in Analysis of Covariance

Program in Quantitative Studies, New York University

Gerardita Colon-Malgady

Department of Quality Assurance and Risk Management, Terence Cardinal Cooke Health Care Center, New York City

In pretest-posttest designs, residual scores created in the analysis of covariance commonly are preferred to difference scores because the latter suffer from reliability problems. This paper develops the reliability of residuals adjusted for a single covariate for comparison to the reliability of difference scores. Comparisons reveal that little is gained by analysis of covariance, which also suffers from reliability problems as the pretest and posttest reliabilities decrease and as their intercorrelation increases.

Educational and Psychological Measurement, Vol. 51, No. 4, 803-807 (1991)
DOI: 10.1177/001316449105100401


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