Help stats gurus! Am reviewing a paper: N=24 w 7 2x2x2x2 RM anovas reporting 4-way interactions (& no correction for mult comparisons). ISO authoritative source to cite in support of statement that N = 24 is way underpowered for 3 and 4-way within-subject interactions. thx!
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Yes, exactly. Unless they justify expecting a specific interaction a priori, they could only detect quite large effect sizes (i.e. power calculation would need to be based on corrected p for multiple comparisons).
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Just thinking, if it is high impact journal and only 24 participants, why not simply ask them to replicate? It should be worth it for them? If it replicates, then we can be confident its not a false positive.
End of conversation
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