- Nov 2022
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scientificallysound.org scientificallysound.org
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Cohen was reluctant to provide reference values for his standardized effect size measures. Although he stated that d = 0.2, 0.5 and 0.8 correspond to small, medium and large effects, he specified that these values provide a conventional frame of reference which is recommended when no other basis is available.
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- Aug 2022
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www.nature.com www.nature.com
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McDiarmid, A. D., Tullett, A. M., Whitt, C. M., Vazire, S., Smaldino, P. E., & Stephens, J. E. (2021). Psychologists update their beliefs about effect sizes after replication studies. Nature Human Behaviour, 5(12), 1663–1673. https://doi.org/10.1038/s41562-021-01220-7
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- Feb 2021
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Witte, E. H., Stanciu, A., & Zenker, F. (2020, October 28). A simple measure for the empirical adequacy of a theoretical construct. https://doi.org/10.31234/osf.io/gdm
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- Dec 2020
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imaging.mrc-cbu.cam.ac.uk imaging.mrc-cbu.cam.ac.uk
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Rules of thumb on magnitudes of effect sizes
Rules of thumb on magnitudes of effect sizes
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- Aug 2020
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www.journalofsurgicalresearch.com www.journalofsurgicalresearch.com
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Althouse, A. D. (2020). Post Hoc Power: Not Empowering, Just Misleading. Journal of Surgical Research, 0(0). https://doi.org/10.1016/j.jss.2019.10.049
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- Jul 2020
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psyarxiv.com psyarxiv.com
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Olsson-Collentine, A., van Assen, M. A. L. M., & Wicherts, J. M. (2020). Postprint—Heterogeneity in direct replications in psychology and its association with effect size [Preprint]. PsyArXiv. https://doi.org/10.31234/osf.io/m23v4
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- Jun 2020
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Brodeur, A., Cook, N., & Heyes, A. (2020). A Proposed Specification Check for p-Hacking. AEA Papers and Proceedings, 110, 66–69. https://doi.org/10.1257/pandp.20201078
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- Mar 2020
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stats.idre.ucla.edu stats.idre.ucla.edu
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Factors that affect power
Factors that affect power.
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Cohen’s recommendations: Jacob Cohen has many well-known publications regarding issues of power and power analyses, including some recommendations about effect sizes that you can use when doing your power analysis. Many researchers (including Cohen) consider the use of such recommendations as a last resort, when a thorough literature review has failed to reveal any useful numbers and a pilot study is either not possible or not feasible. From Cohen (1988, pages 24-27):
Recommendations from Cohen about choosing the effect size when doing a power analysis.
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