Optimal foldover designs |
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Authors: | Peter W.M. John |
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Affiliation: | Department of Mathematics , The University of Texas at Austin , Austin, TX, 78712 |
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Abstract: | An obvious strategy for obtaining a Doptimal foldover design for p factors at two levels each in 2N runs is to fold a Doptimal main effects plan. We show that this strategy works except when N = 4t + 2 and s is even In that case there are two different classes of D-optimal main effects plans with N runs that have the same determinant. However folding them gives two different values foi the D-optimality criteiion One set of designs is D-optimal The other is not. |
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Keywords: | fractional factorials D-optimal designs foldover designs |
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