Publication date: 04/12/2021

Value Labels Example

You want to test an internet-based software application to detect issues arising from components in the operating environment. The four components of interest consist of a browser, the operating system, the computer’s RAM, and the connection speed. To minimize testing time, you restrict yourself to testing two-way interactions.

Construct a Strength 2 covering array to test the required combinations of factor levels.

1. Select DOE > Special Purpose > Covering Array.

2. Select Help > Sample Data Library and open Design Experiment/Software

3. Click the Covering Array red triangle and select Load Factors.

The factors and their levels appear in the Factors outline.

Figure A.31 Factors Outline for Software Factors 

Factors Outline for Software Factors

Notice that the Role of the four factors is described as Categorical.

4. Click Continue.

The Restrict Factor Level Combinations outline opens. Since all combinations of settings are possible, leave this set to None.

5. Click Make Design.

6. Click Make Table.

7. In the columns panel, click the asterisk next to Web Browser and select Value Labels.

Figure A.32 Column Info Window for Factor A 

Column Info Window for Factor A

Notice that Web Browser has a Numeric data type and a Nominal modeling type. The underlying values of Web Browser are the integers 1, 2, 3, 4, and 5. These values are assigned value labels corresponding to the values that you entered when you constructed the design.

Change the value label for 2 from IE to Internet Explorer.

8. Select 2 = IE in the Value Labels list.

Figure A.33 Value Labels Panel with Selection 

Value Labels Panel with Selection

9. Type Internet Explorer next to Label.

10. Click Change.

The change appears in the data table.

Note: To use the numeric values and not the labels, deselect Use Value Labels.

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