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I want to do a power analysis for my 3x2x2 design, but I am not using the full factorial design, but rather a fractional one, so instead of using the full 12 groups, I actually only have 6. I was wondering how I would estimate the needed sample size to do so? Would it be appropriate to calculate the number per cell needed for the full factorial design and then just multiply that by 6 instead of by 12?

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