Anova simple effects - mean difference and Cohen’s d have opposite signs
Posted: Tue May 02, 2023 12:59 pm
Hi all,
I’m hoping someone might help me understand something that appears inconsistent in some output. We’ve just run a 2X3 between groups factorial anova, and am looking at the simple effects to disentangle the interaction. For some of the comparisons, the unstandardised mean difference is negative, but the corresponding Cohen’d is positive. Shouldn’t the sign of these values be consistent? Is there something about the way Jamovi calculates Cohen’s d that can result in the opposite sign to the unstandardised difference?
Thanks
I’m hoping someone might help me understand something that appears inconsistent in some output. We’ve just run a 2X3 between groups factorial anova, and am looking at the simple effects to disentangle the interaction. For some of the comparisons, the unstandardised mean difference is negative, but the corresponding Cohen’d is positive. Shouldn’t the sign of these values be consistent? Is there something about the way Jamovi calculates Cohen’s d that can result in the opposite sign to the unstandardised difference?
Thanks
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