Use to specify the mixture amounts and the component bounds. For an extreme vertices design, you can also specify linear constraints. For more information, go to How are linear constraints different than component bounds in a mixtures design?.
- Total Mixture Amount
- The mixture total describes the amount of the mixture that is used in the experiment. That is, the sum of the components must be equal to the mixture total.
- Single total: Enter any positive number to express values in terms of actual measurement units that are relevant to the experiment rather than expressing measurements as proportions. For proportions, all components sum to 1. The default value is 1.
- Multiple totals (up to 5): Enter up to five positive numbers to specify multiple amounts of the mixture. When a mixture experiment is performed at two or more levels of the total mixture amount, it is called a mixture-amounts experiment. In a mixture-amounts experiment, the response is assumed to depend on the proportions of the components and the amount of the mixture. For example, the amount applied and the proportions of the ingredients of a plant food may affect the growth of a house plant.
- Component Bounds Specified in Amount (lower and upper are for the first total, if you
specified more than one)
- You can specify bounds for the components. Components are the ingredients that make up a mixture. A component bound puts upper and lower limits on individual components. For more information, go to When are upper and lower bounds necessary in a mixtures design?.
- Enter text to change the name of the components.
- Enter the value of the lower bound constraint for each component. Lower bounds are necessary when any of the components must be in the mixture. For example, lemonade must contain lemon juice.
- Enter the value of the upper bound constraint for each component. Upper bounds are necessary when the mixture cannot contain more than a specified proportion of an ingredient. For example, a cake mixture cannot contain more than 5% baking powder.