On The Optimal Choice of Cube and Star Replications in Restricted Second-Order Designs

U. C Nduka and P. E. Chigbu

Communications in Statistics - Theory and Methods, 2014, vol. 43, issue 19, 4195-4214

Abstract: This article examines the central composite design in which some of the experimental runs are replicated. Three different classes of N-point designs are compared using the criterion of Schur's ordering under orthogonality, rotatablity, and slope- rotatablity conditions. The response surface designs with the star portion replicated seem to have more potential than others under orthogonality condition, while the designs with the cube portion replicated is preferable to the designs with their star portion or only the center point replicated under rotatable and slope-rotatable conditions.

Date: 2014
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DOI: 10.1080/03610926.2012.725499

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