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P.Mean >>
Category >> Post hoc power (created 2007-09-11).
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Post hoc power represents a calculation of power after the data have been collected. These pages explain why this calculation is not appropriate. Also see Category: Sample size justification, Category: Writing research papers. Other entries about post hoc power can be found in the post hoc power page at the StATS website.
2008
[[There is no material yet from my new site.]]
All of the material above this paragraph is licensed under a
Creative Commons Attribution 3.0 United States License. This page was written by
Steve Simon and was last modified on
2010-04-11. The material
below this paragraph links to my
old website, StATS. Although I wrote all of the material
listed below, my ex-employer, Children's Mercy Hospital, has claimed copyright
ownership of this material. The brief excerpts shown here are included under
the fair use provisions of U.S. Copyright laws.
2008
2007
2006
2005
Stats: Post hoc power is never justified (May 13, 2005). Someone wrote in and was upset that a referee was insisting on post hoc power for all the outcome measures, and he only wanted to compute post hoc power for the negative outcomes (the outcomes that did not achieve statistical significance).
Stats: Post hoc power (November 1, 2002). Dear Professor Mean, The results of my study were negative, and the journal reviewer insists that I perform a post hoc power calculation. How do I do this? -Jittery Jerry
What now?
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