Screening Concepts and Designs for Experiments with Mixtures

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Abstract
A strategy for determining the most important components in a mixture system is developed. The proposed screening designs are useful in those situations where the number of candidate components, q, is large. Our simplex screening designs, which contain 2q + 1 or 3q + 1 points, are recommended when it is possible to experiment over the total composition range of all components (0-100%) or the experimental region can be expressed as a simplex in terms of pseudocomponents. We recommend extreme vertices screening designs, which contain approximately q + 10 points, when some or all of the components are subject to upper and lower constraints. Examples are included to illustrate the proposed designs and associated analyses.

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