Output Options
In the Screening Design platform, use the Output Options panel to perform the following tasks:
• specify the order for the runs in the design data table
• specify center points and replicates for factorial designs
• construct the design table
• return to a previous point in the Screening Design window
The Output Options panel contains these options:
Run Order
The Run Order options determine the order of the runs in the design table.
Keep the Same
Rows in the design table are in the same order as in the Coded Design or Design sections.
Sort Left to Right
Columns in the design table are sorted from left to right.
Randomize
Rows in the design table are in random order.
Sort Right to Left
Columns in the design table are sorted from right to left.
Randomize within Blocks
(Available only for designs that contain blocks.) Rows in the design table are in random order within the blocks.
Center Points and Replicates
The center point and replicate options are available for factorial designs.
Number of Center Points
Specifies how many additional runs to add as center points to the design. A center point is a run where every continuous factor is set at the center of the factor’s range.
For designs that include both continuous and categorical factors, the center points are distributed as follows:
1. The settings for the categorical factors are ordered using the value ordering specified in the Factors section.
2. One center point is assigned to each combination of the settings of the categorical factors in order, and this is repeated, until all center points are assigned.
Number of Replicates
For designs in the Design List, specify the number of times to replicate the entire design, including center points. One replicate doubles the number of runs.
Make Table
Click Make Table to construct the Screening Design data table.
In the Screening Design table, the Table panel (in the upper left) contains the following scripts. To run a script, click the green triangle next to the script name.
Figure 10.11 The Design Data Table
The name of the table is the design type that generated it.
The design table includes the following scripts:
Screening
Runs the DOE > Classical > Factor Screening > Fit Two Level Screening platform. Provided only when all factors are at two levels.
Model
Runs the Analyze > Fit Model platform.
Evaluate Design
Runs the DOE > Design Diagnostics > Evaluate Design platform.
DOE Dialog
Re-creates the Screening Design window that you used to generate the design table. The script also contains the random seed used to generate your design.
Run the Screening or Model scripts to analyze response data.
If the design was selected from the Design List, the design table contains a Pattern column. The Pattern column contains entries that summarize the run in the given row. Low settings are denoted by “–”, high settings by “+”, and center points by “0”. Pattern can be useful as a label variable in plots.