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Publication date: 11/10/2021

Factor Changes Example

The Battery sample data table, found in the Design Experiment folder, contains data from an experiment that studies the open current voltage of batteries (OCV). The design is a two-way split-plot design. For further background, see Two-Way Split-Plot Experiment.

1. Select Help > Sample Data Library and open Design Experiment/Battery

2. Click the asterisk to the right of the factor C1 in the columns panel.

3. Select Factor Changes.

Figure A.25 Factor Changes Panel for C1 

Factor Changes Panel for C1

The value of Factor Changes for C1 is Hard. Figure A.24 shows that the value of Factor Changes for A1 is Very Hard.

4. Click OK.

5. In the data table, click the green triangle next to the DOE Dialog script.

6. Open the Factors outline.

Figure A.26 Factors Outline for Battery Experiment 

Factors Outline for Battery Experiment

The factors A1, A2, A3, and A4 have Changes set to Very Hard, and the factors C1 and C2 have Changes set to Hard. When the Custom Design platform constructs the design table, it saves these specifications to the appropriate columns as Factor Changes column properties.

In the Design outline, notice the Whole Plots and Subplots factors.

Figure A.27 Design Outline Partial View 

Design Outline Partial View

To account for the factor changes that are Hard and Very Hard, two factors are created by the Custom Design platform. The Whole Plots factor groups the runs where the Very Hard factor levels are constant and the Subplots factor groups the runs where the Hard factors levels are constant. These factors need to be included as model effects when you enter columns with the Factor Changes column property in the Evaluate Design and Augment Design platforms.

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