To rename process variables or change levels
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1    Choose Stat > DOE > Modify Design.

2    Choose Modify variables and click Specify.

3    Click Process Variables.

4    Do one or both of the following:

·    Under Name, click in the first row and type the name of the first process variable. Then, use the arrow key to move down the column and name the remaining process variables.

·    Under Low, click in the process variable row you would like to assign values and enter any numeric or text value. Use the arrow key to move to High and enter a value. For numeric levels, the High value must be larger than Low value.

Repeat to assign levels for other process variables.

5    Click OK.