Stat > DOE > Response Surface > Create Response Surface Design > Factors
Complete the following steps to specify details about the factors in the design.
Under Levels Define, choose if the factor setting represent Cube points or Axial points.
Under Name, enter a descriptive name for each factor. By default, Minitab names the factors alphabetically, skipping the letter I.
Under Continuous Factors, enter the name of each factor and the high and low levels for each factor. For example, an engineer wants to test two different temperatures and enters 150 for low and 250 for high. By default, Minitab sets the low level of all factors to −1 and the high level to +1.
Under Categorical Factors (if you have any), enter the name, number of levels, and level values.