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Educational and Psychological Measurement
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What's this?

A Measure of Experimental Effect Size Based on Success Rates

Peter F. W. Preece

School of Education, University of Exeter

It is shown how the difference between the success rates in two treatment groups is related to the treatment-outcome correlation and the overall success rate. A new measure of effect size is proposed, which is easily calculated and readily interpretable in terms of the ratio of success rates in the treatment groups.

Educational and Psychological Measurement, Vol. 43, No. 3, 763-766 (1983)
DOI: 10.1177/001316448304300310
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