![]() Please consult or another reference.Ĭohen, Jacob. While for an odd number of means, there will be one additional mean at one extreme:ĭiscussion of the power associated with these effects is beyond the scope of this note. Then:įor Pattern 3, maximum dispersion for an even number of means occurs with half at one extreme and the other half at the other: Henceforth we will take there to be k means, where k > 2.įor Pattern 1, the dispersion is minimized when the intermediate means are all at the midpoint of the range, and then:įor Pattern 2, it is assumed that the k means are equally spaced through the range. When there are more than two means, Cohen considers three patterns of dispersion: If the model is a Univariate ANOVA with two groups, and the number of observations in each group is equal, then the standardized range of population means, Cohen's d, is given by Where f^2 is the square of the effect size, and eta^2 is the partial eta-squared calculated by SPSS. ![]() Cohen discusses the relationship between partial eta-squared and Cohen's f : SPSS cannot calculate Cohen's f or d directly, but they may be obtained from partial Eta-squared. ![]()
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