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Hi, is the effect size calculation for 3-arm cluster randomized trial as outlined in "Practical Statistical Power Analysis using WebPower and R" based on Cohen d calculation for effect sizes? I ask because I need to outline that information in my writing, together with citing your work. Please advise.

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It was based on

Liu, X. S. (2013). Statistical power analysis for the social and behavioral sciences: Basic and advanced techniques. Routledge.
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