Effect size Eta-squared for the mixed ANOVA in SPSS

After conducting a mixed ANOVA in SPSS 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. However, Cohen (1992) uses the effect size f, which will require a transformation of your Eta-Squared.

Cohen (1988), p. 284 showed the proper formula for the transformation. An effect size should only be reported for a significant effect (aka. low enough p-value).

📚 Cohen, J. (1992): Quantitative methods in psychology: A power primer. Psychological bulletin, pp. 155-159.
📚Cohen, J. (1988): Statistical Power Analysis for the Behavioral Sciences.

⏰ Timestamps:
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0:00 Introduction and prerequisites
0:13 Interpreting partial eta-squared
0:58 Transforming eta-squared to f
1:23 Calculating generalized eta-squared

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