An Optimal Split-Plot Design for Performing a Mixture-Process Experiment

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dc.contributor.authorNjoroge, Gladys G.
dc.contributor.authorSimbauni, Jemimah A.
dc.contributor.authorKoske, Joseph A.
dc.date.accessioned2021-02-12T08:49:03Z
dc.date.available2021-02-12T08:49:03Z
dc.date.issued2017
dc.descriptionAn Article Published in Science Journal of Applied Mathematics and Statisticsen_US
dc.description.abstractIn many mixture-process experiments, restricted randomization occurs and split-plot designs are commonly employed to handle these situations. The objective of this study was to obtain an optimal split-plot design for performing a mixture-process experiment. A split-plot design composed of a combination of a simplex centroid design of three mixture components and a 22 factorial design for the process factors was assumed. Two alternative arrangements of design points in a split-plot design were compared. Design-Expert® version 10 software was used to construct I-and D-optimal split-plot designs. This study employed A-, D-, and E- optimality criteria to compare the efficiency of the constructed designs and fraction of design space plots were used to evaluate the prediction properties of the two designs. The arrangement, where there were more subplots than whole-plots was found to be more efficient and to give more precise parameter estimates in terms of A-, D- and E-optimality criteria. The I-optimal split-plot design was preferred since it had the capacity for better prediction properties and precision in the measurement of the coefficients. We thus recommend the employment of split-plot designs in experiments involving mixture formulations to measure the interaction effects of both the mixture components and the processing conditions. In cases where precision of the results is more desirable on the mixtures as well as where the mixture blends are more than the sets of process conditions, we recommend that the mixture experiment be set up at each of the points of a factorial design. In situations where the interest is on prediction aspects of the system, we recommend the I-optimal split-plot design to be employed since it has low prediction variance in much of the design space and also gives reasonably precise parameter estimates.en_US
dc.identifier.citationGladys Gakenia Njoroge, Jemimah Ayuma Simbauni, Joseph Arap Koske. An Optimal Split-Plot Design for Performing a Mixture-Process Experiment. Science Journal of Applied Mathematics and Statistics. Vol. 5, No. 1, 2017, pp. 15-23.doi: 10.11648/j.sjams.20170501.13en_US
dc.identifier.issn2376-9491
dc.identifier.issn2376-9513
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/21432
dc.language.isoenen_US
dc.publisherScience Publishing Groupen_US
dc.subjectOptimalityen_US
dc.subjectSplit-Plot Designen_US
dc.subjectEfficiencyen_US
dc.subjectMixture Componentsen_US
dc.subjectProcess Variablesen_US
dc.titleAn Optimal Split-Plot Design for Performing a Mixture-Process Experimenten_US
dc.typeArticleen_US
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