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This paper considers the study of the optimality of the extended design generated by adding few runs to an existing E(χ2)-optimal mixed-level supersaturated design. This paper covers the work of Gupta et al. (2010, 2012) on extended two-level and s-level supersaturated designs as two special cases. A lower bound to E(χ2) has been obtained for the proposed designs. A small example is presented here...
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