A Measure of Experimental Effect Size Based on Success Rates

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...

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Bibliographic Details
Published in:Educational and psychological measurement 1983-09, Vol.43 (3), p.763-766
Main Author: Preece, Peter F. W.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Psychometrics. Statistics. Methodology
Statistics. Mathematics
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Summary: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.
ISSN:0013-1644
1552-3888
DOI:10.1177/001316448304300310