Selecting the Slack Variable in Mixture Experiment Selección de la variable de holgura en experimentos para mezclas
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چکیده
A mixture experiment is one where the response depends only on the relative proportions of the ingredients present in the mixture. There are different regression models used to analyze mixture experiments, such as Scheffé model, slack-variable model, and Kronecker model. Interestingly, slack-variable model is the most popular one among practitioners, especially formulators. In this paper, I want to emphasize the appealing properties of slack-variable model. I discuss: how to choose the component to be slack variable, numerical stability for slack-variable model and what transformation could be used to reduce the collinearity. Practical examples are illustrated to support the conclusions.
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