The Comparative Reliability of Simple and Residualized Difference Scores.

Williams, Richard H.; Zimmerman, Donald W.

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Peer reviewed

ERIC Number: EJ280292

Record Type: Journal

Publication Date: 1982

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The Comparative Reliability of Simple and Residualized Difference Scores.

Williams, Richard H.; Zimmerman, Donald W.

Journal of Experimental Education, v51 n2 p94-97 Win 1982-83

The reliability of simple difference scores is greater than, less than, or equal to that of residualized difference scores, depending on whether the correlation between pretest and posttest scores is greater than, less than, or equal to the ratio of the standard deviations of pretest and posttest scores. (Author)

Descriptors: Achievement Gains, Comparative Analysis, Correlation, Pretests Posttests, Scores, Statistical Studies, Test Reliability, Test Theory, Testing

Publication Type: Journal Articles; Reports - Research

Education Level: N/A

Audience: N/A

Language: English

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