Construction of mixed-level rotatable response surface designs when experimental unit experiences overlap effects

Verma, Ankita and Jaggi, Seema and Varghese, Eldho and Varghese, Cini and Bhowmik, Arpan and Datta, Anindita and Hemavathi, M (2021) Construction of mixed-level rotatable response surface designs when experimental unit experiences overlap effects. Communications in Statistics - Simulation and Computation. pp. 1-16.

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Abstract

This paper describes the response surface model for mixed-level factors of the form 2n×3 where experimental units/plots experience the overlap effects from immediate left and right neighboring units. Conditions have been derived for the orthogonal estimation of the parameters of the model. A method of constructing mixed-level response surface designs of the form 2n×3 has been proposed. The designs developed satisfy the derived conditions of rotatability. Further, the method has been extended to the case of mixed-level rotatable designs of the form 2n×3n. An algorithm for the estimation of overlap effects has also been discussed, along with an illustration.

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