Specify further design information for Define Custom 2-Level Factorial Design

Stat > DOE > Factorial > Define Custom Factorial 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.
Center Points
To identify center points, Minitab Statistical Software uses a column that contains 0 in rows that are center points and 1 in all of the other rows. 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 center points after you define the design.
  • No Center Points: Select this option if no column with the correct format is in the worksheet or if the worksheet contains no center point runs.
  • 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:
  • StdOrder: This column contains the standard order of the runs. Center points are the last run in each block in standard order.
  • RunOrder: 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.
  • CenterPt: This column contains a 0 in the first row where the two numeric factors are set halfway between their high and low settings. In other rows, this column contains 1.
  • Blocks: This column has 1 for the first block and 2 for the second block with respect to the standard order of the design. Because blocks are randomized, 2 precedes 1 in run order. All runs for the same block are contiguous in run order.
C1 C2 C3 C4 C5 C6
StdOrder RunOrder CenterPt Blocks Time Temperature
10 1 0 2 35 175
8 2 1 2 20 200
6 3 1 2 20 150
7 4 1 2 50 150
9 5 1 2 50 200
2 6 1 1 50 150
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