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Journal of Educational…

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Harris, Richard J.	1
Quade, Dana	1
Raffeld, Paul	1
Reynolds, William M.	1
Vermillion, James E.	1

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The Minimally Important Difference Significant Criterion for Sample Size.

Peer reviewed

Harris, Richard J.; Quade, Dana – Journal of Educational Statistics, 1992

A method is proposed for calculating the sample size needed to achieve acceptable statistical power with a given test. The minimally important difference significant (MIDS) criterion for sample size is explained and supported with recommendations for determining sample size. The MIDS criterion is computationally simple and easy to explain. (SLD)

Descriptors: Equations (Mathematics), Estimation (Mathematics), Experimental Groups, Mathematical Models

Increasing the Efficiency of Pretest-Posttest Designs.

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Raffeld, Paul; Reynolds, William M. – 1977

The pretest-posttest design referred to as Design 2 by Campbell and Stanley (1963) is commonly used in educational research and evaluation. The tenability of the assumption of a zero population difference commonly used with this design is questioned. A nonzero population estimate based on the mean difference observed in test-retest reliability…

Descriptors: Control Groups, Correlation, Experimental Groups, Hypothesis Testing

Regression Artifacts in Nonequivalent Control Group Designs: An Empirical Investigation of Bias in ANCOVA and Matching Designs.

Vermillion, James E. – 1980

The presence of artifactual bias in analysis of covariance (ANCOVA) and in matching nonequivalent control group (NECG) designs was empirically investigated. The data set was obtained from a study of the effects of a television program on children from three day care centers in Mexico in which the subjects had been randomly selected within centers.…

Descriptors: Analysis of Covariance, Control Groups, Error of Measurement, Experimental Groups