Effect size Eta-squared for the One-Way ANOVA in R

After conducting a one-way ANOVA in R it can be helpful to calculate the effect size Eta-Squared (Eta²). In most circumstances it is used for comparison with other studies.

Be aware that the classification of Eta² is reasearch field specific. For the social and behavioral sciences, the paper Cohen, J. (1992), A Power Primer, p. 157 is usually cited:

📚 Cohen, J. (1992): Quantitative methods in psychology: A power primer. Psychological bulletin, pp. 155-159.

⏰ Timestamps:
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0:00 Introduction and prerequisites
0:12 Using anova_test() from rstatix to calculate Eta-squared
0:31 Classification of Eta-Squared

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