To set the holding level for design variables not in the plot (mixture design)
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1    In the Setup subdialog box, click Settings.

2    Do one or more of the following to set the holding values:

·    For components (only available for design with more than three components):

-    To use the preset values for components, choose Lower bound setting, Middle setting, or Upper bound setting under Hold components at. When you use a preset value, all components not in the plot will be held at their lower bound, middle, or upper bound.

-    To specify the value at which to hold the components, enter a number in Setting for each component that you want to control. This option allows you to set a different holding value for each component.

·    For process variables:

-    To use the preset values for process variables, choose High setting or Low setting under Hold process variables at. When you use a preset value, all variables not in the plot will be held at their high or low settings.

-    To specify the value at which to hold the process variables, enter a number in Setting for each of the process variables you want to control. This option allows you to set a different holding value for each process variable.

·    For an amount variable:

-    In Hold mixture amount at, choose one of the mixture totals. Minitab displays the multiple totals that you entered in the Components subdialog box when you were creating the design. The default hold value is the average of the multiple totals.

3    Click OK.