Modify Design - Mixture Process Variables
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Stat > DOE > Modify Design > check Modify variables > Specify > Process variables

Allows you to rename process variables and change process variable levels.

Dialog box items

Process Variable

Name: Enter text to change the name of the process variables.

Type: Shows whether the variable is numeric or text. This column does not take any input.

Lower: Enter the value of the low level for each process variable.

Upper: Enter the value of the high level for each process variable.