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Design Issues In Fractional Factorial Split-Plot Experiments

Summary: [This abstract is based on the authors' abstract.] It is often impractical to perform experimental runs of a fractional factorial in a completely random order. In these cases, restrictions are imposed on the randomization of the experimental trials, and the design is said to have a split-plot structure. However, the nature of the design implies that not all factorial effects can be estimated with the same precision. This paper discusses the impact of randomization restrictions on the design and demonstrates how it affects estimation, precision, and the use of resources. The affect of these issues on design selection is demonstrated in an actual industrial experiment.

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