Using quantile plots of the prediction variance for comparing designs for a constrained mixture region: an application involving a fertilizer experiment

A. I. Khuri, J. M. Harrison and J. A. Cornell

Journal of the Royal Statistical Society Series C, 1999, vol. 48, issue 4, 521-532

Abstract: Summary. Vining and co‐workers have used plots of the prediction variance trace (PVT) along the so‐called prediction rays to compare mixture designs in a constrained region R. In the present paper, we propose a method for describing the distribution of the prediction variance within the region R by using quantile plots. More comprehensive comparisons between mixture designs are possible through the proposed plots than with the PVT plots. The utility of the quantile plots is illustrated with a four‐component fertilizer experiment that was initiated in São Paulo, Brazil.

Date: 1999
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