Partial eta-squared are only used for factorial ANOVAs, and not one-way ANOVAs.

Question

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Partial eta-squared is a measure of effect size that is used to assess the proportion of variance in the dependent variable that is explained by the independent variable. It is typically used in factorial ANOVAs, where there are multiple independent variables, to assess the relative importance of each variable. In one-way ANOVAs, where there is only one independent variable, partial eta-squared is not used.

Partial Eta-Squared Are Only Used for Factorial ANOVAs, and Not