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The F ratio statistic has a numerator and denominator degrees of freedom. Thus, you report: F (numerator_df, denominator_df) = F_value, p = ..., effect size = ... The numerator degrees of freedom relates to the factor of interest; the denominator degrees of freedom corresponds to the degrees of freedom for the error variance. The exact way that these ...


The numbers inside the parentheses are the degrees of freedom for the F-statistic. The second number is the within-group degrees of freedom. When you have the same number of subjects in all conditions, then the second number will be the number of subjects - the number of cells (conditions) in your design.

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