The D-, A-, E- and T-optimal Values of a Second Order Rotatable Design in Four Dimension Constructed Using Balanced Incomplete Block Designs
American Journal of Applied Mathematics
Volume 8, Issue 3, June 2020, Pages: 83-88
Received: Mar. 5, 2020;
Accepted: Apr. 10, 2020;
Published: May 14, 2020
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Kabue Timothy Gichuki, Department of Physical and Mathematical Sciences, School of pure and applied Sciences, Mount Kenya University, Thika, Kenya
Koske Joseph, Department of Statistics and Computer Science, School of Biological Sciences, Moi University Eldoret, Kenya
Mutiso John, Department of Statistics and Computer Science, School of Biological Sciences, Moi University Eldoret, Kenya
In response surface methodology, optimal designs are experimental designs generated based on a particular optimality criterion and are optimal only for a specific statistical model. Optimality criterion are single number criteria sometimes called alphabetical optimality criteria where each one intends to capture an aspect of the ‘goodness’ of a design. Most studies on optimization of process variables have concentrated on Central Composite Designs (CCD) yet second order rotatable deigns with any number of factors with reasonably small number of points constructed using properties of balanced incomplete block designs exist. A class of experimental designs that are optimal with respect to some statistical criterion are said to be Optimal designs. These designs allow parameter estimation with increased precision using fewer experimental runs, without bias and with minimum variance thus reducing time and costs of experimentation as opposed to non-optimal designs. A measure of relative efficiency of one design over another according to an optimality criterion aids in discriminating between the two designs for the “best” design. The D-, E-, A- and T-Optimal values of the general second order rotatable design in four dimensions constructed using balanced incomplete block designs when the number of replications (r) are less than three the number of times (λ) pairs of treatments occur together in the design were found which may be used to determine the relative efficiency of the general design to the D-, E-, A- and T-Optimal designs.
Kabue Timothy Gichuki,
The D-, A-, E- and T-optimal Values of a Second Order Rotatable Design in Four Dimension Constructed Using Balanced Incomplete Block Designs, American Journal of Applied Mathematics.
Vol. 8, No. 3,
2020, pp. 83-88.
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