Max Rady College of Medicine

Term: Minimum Detectable Effect Size

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Glossary Definition

Last Updated: 2014-10-14


A minimum detectable effect is the smallest estimated true effect (i.e., group difference) that would be statistically significant at the 0.05 level using 80 percent power. In other words, it is the minimum required true difference between groups that would result in a significant difference 80% of the time.


  • Katz A, Chateau D, Bogdanovic B, Taylor C, McGowan K-L, Rajotte L, Dziadek J. Physician Integrated Network: A Second Look. Winnipeg, MB: Manitoba Centre for Health Policy, 2014. [Report] [Summary] [Updates and Errata] (View)

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