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Table 2 Sample sizes required for 90% power and 1% two-sided alpha: interaction
From:
Design, analysis and presentation of factorial randomised controlled trials
Magnitude of effects (in units of standard deviations)
Main effect
Interaction
Total sample size to detect interaction
0.3
0.6
664
0.3
0.3
2656
0.3
0.15
10624
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