Stat > DOE > Response Surface > Define Custom Response Surface Design > Low/High
Low and High Values for Factors
For each numeric factor in the list, verify that the settings are correct.
Low: The initial value matches the minimum numeric value in the column. The minimum and the low level can be different if the design contains a botched run where the factor level is less than the low level that you intended or if the design has axial points that extend beyond the cube. If your design contains a botched run with a lower level, modify the low level to the correct value for the factor.
High: The initial value matches the maximum numeric value in the column. The maximum and the high level can be different if the design contains a botched run where a factor level is greater than the high level that you intended or if the design has axial points that extend beyond the cube. If your design contains a botched run with a higher level, modify the high level to the intended value for the factor.
Worksheet Data Are
Select how the data are recorded in the worksheet. Text factors are uncoded and the levels are defined as the values in the column.
Coded: High and low levels of numeric factors are coded as −1 and 1. Minitab interprets values other than −1 and 1 as botched runs.
Uncoded: High and low levels of the numeric factors are in the units of the data.
