D-Optimal and D-Efficient Equivalent-Estimation Second-Order Split-Plot Designs

Journal of Quality Technology vol. 42 issue 4 - October 2010

Abstract: [This abstract is based on the authors' abstract.] Many industrial experiments use split-plot designs as a cost-efficient method of reducing the number of independent settings of hard-to-change factors. Generally, model estimation for split-plot designs requires the use of generalized least squares, but in some cases, ordinary least squares estimates work as well. These equivalent-estimation designs do not require estimation of the variance components in the split-plot model. Alternatively, D-optimal designs provide efficient estimation of the fixed effects of the statistical model. The relationship between these designs for a second-order response surface model is explored, and an algorithm is proposed for generating D-efficient equivalent-estimation split-plot designs.

Keywords: D-optimality; Equivalency; Estimation; Least squares; Split-plot design

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