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A Note on Misconceptions Concerning Prospective and Retrospective Power

Bruno D. Zumbo and Anita M. Hubley
Journal of the Royal Statistical Society. Series D (The Statistician)
Vol. 47, No. 2 (1998), pp. 385-388
Published by: Wiley for the Royal Statistical Society
Stable URL: http://www.jstor.org/stable/2988675
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Note on Misconceptions Concerning Prospective and Retrospective Power
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Abstract

This paper addresses some misconceptions concerning prospective and retrospective power when journal editors, reviewers and readers want to know the observed power of statistical tests within a completed study. In addition, a practical solution to both the problem of computing the power after a study has been conducted and the critical evaluation of null findings is suggested.

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