Specify further information about the design in Define Custom Definitive Screening Design

Stat > DOE > Screening > Define Custom Screening Design > Designs

You can specify the design columns that are already in the worksheet. If you do not have columns that contain the design information, then Minitab creates new columns.

Standard Order Column
If you do not specify a column, then Minitab creates a column that is the row order of the data. Standard order is also called Yates' order.
  • Order of the data: Select this option if no standard order column is in the worksheet or if the standard order is the order in the worksheet.
  • Specify by column: Select this option if the worksheet contains a column that identifies the standard order of the experimental runs.
Run Order Column
If you do not specify a column, then Minitab creates a column that is the row order of the data.
  • Order of the data: Select this option if no run order column is in the worksheet or if the experimental runs are in the order that they should be done.
  • Specify by column: Select this option if a column in the worksheet identifies the order that the experimental runs should be done.
Point Type Column
To identify the type of point, Minitab Statistical Software uses a column with these values:
  • 0: A row where all factors are at their midpoints (center points).
  • 1: A row where all factors are at their low or high settings (cube points or corner points).
  • 2: A row where some factors are at their midpoints and others are at their low or high settings.
If you do not specify a column, then Minitab creates a column with 1 in every row. You can directly edit this new column to identify point types after you define the design.
  • Unknown: Select this option if no column with the correct format is in the worksheet.
  • Specify by column: Select this option if a column with the correct format is in the worksheet.
Blocks
If you specify a column with multiple values, Minitab Statistical Software can include a term for blocks in the model. If you do not specify a column, then Minitab creates a column with 1 in every row. You can directly edit this new column to identify blocks after you define the design
  • No blocks: Select this option if no block column is in the worksheet or if the design has no blocks.
  • Specify by column: Select this option if a column in the worksheet identifies which runs are in each block.
In this worksheet, these columns provide more information about the design:
  • Standard Order: This column contains the standard order of the runs. Center points are the last run in each block in standard order.
  • Run Order: This column contains the order that the experimental runs should be done. In this worksheet, the order of the factor settings is randomized so the run order is not the standard order.
  • Point Type: This column contains a 2 in the first row where temperature is halfway between its high and low settings. In the second row, this column contains 1 because time and pressure are at their low settings and temperature is at its high setting. The 4th row contains 0 because the three continuous factors are all set halfway between their high and low settings.
  • Blocks: This column has 1 in all rows because the design has no blocks.
C1 C2 C3 C4-T C5 C6 C7 C8
Time Temperature Pressure Catalyst Blocks Standard Order Run Order Point Type
50 175 10 B 1 3 1 2
20 200 10 B 1 6 2 1
20 150 35 B 1 8 3 2
35 175 35 A 1 9 4 0
20 175 60 A 1 4 5 2
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