I have a factorial design of 5 factors with 3 levels each giv
Hi All
I have a factorial design of 5 factors with 3 levels each giving 243 combinations of factors and levels. Out of these I am limited to only assessing 27 combinations so I have used sas optex to create the incomplete design. I want to find a formula that will help me work out the effective sample size used to calculate the 2-way interactions if I use this design and sample size of n. Does anyone know a formula to do this?
Thanks in advance
Kerry
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