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Title: Blocked foldover designs with column permutations Authors:  Po Yang - University of Manitoba (Canada) [presenting]
William Li - Shanghai Jiao Tong University (China)
Abstract: Follow-up experimentation is often necessary for the successful use of fractional factorial designs. Foldover is one of the techniques used in follow-up experiments. Since follow-up experiments are usually conducted in different stages, the blocking effect is often considered. We consider foldover designs with column permutation when a block factor is included. It is shown that a pair of a permutation plan and a fold-over plan has generalized minimum aberration for the blocked combined foldover design if and only if it has generalized minimum aberration for the unblocked combined foldover design.