• Q. I have completed my study and I want to verify if the statistical power of my hypothesis test is sufficiently high given the sample size I assumed. What is your professional advice as a statistician?

• A. Don’t do it!  You will find a very commendable justification of this advice together with useful recommendations on the use of confidence intervals in The Use of Predicted Confidence Intervals When Planning Experiments and the Misuse of Power When Interpreting Results and in the article  Post Hoc Power Analysis: An Idea Whose Time Has Passed?

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• Thanks are due to the Professor Marc Levine (first author) and for Mr Stephen Cavanaugh (Director of Operations for the journal Pharmacotherapy) for granting permisson for the above article to be made available in this way for use by learners.
  

Retrospective Power Calculations Versus Examination of Confidence Intervals by Margaret MacDougall is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.