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Hedges' g or Cohen d

Dear all

I have a question for you guys. Recently, in a scientific Journal, I have had the following recommendation “Hedges' g should be used for very small sample sizes (<20), and it should be used over Cohen's d.”

Do you agree with this statement? In sports science and sport medicine, we have frequently less than 20 participants and could be a good point to think of Hedge's g.

Kind regards


  • Dear all,

    I have answered to my question using the following paper. If you have the same one, please read it. 

    Lakens D. Calculating and reporting effect sizes to facilitate cumulative science: a practical primer for t-tests and ANOVAs. Front Psychol. 2013 Nov 26;4:863. doi: 10.3389/fpsyg.2013.00863.

  • If your conclusion depends crucially on whether you use Cohens's d or Hedge's g, this suggests that considerable caution is in order. But JASP provides both (I just saw we had a fix in our Hedges g -- a new JASP version comes out end up this month already)



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