The factors and their settings are given in the data table Phone Factors.jmp. Create a Strength 2 covering array by following these steps.
1.
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The Phone Factors.jmp data table contains the factors and their settings.
2.
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Select DOE > Special Purpose > Covering Array.
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Notice that the menu next to Strength: t = , is set to 2 by default.
3.
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From the Covering Array red triangle menu, select Load Factors.
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Figure 19.10 Factors Outline for Phone Factors
4.
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Click Continue.
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The filter gives an intuitive way to specify disallowed combinations. The script provides a quick and easy way to specify disallowed combinations, but requires that you have written or saved a script. In this example, if you do not want to specify combinations using the filter, skip to Specify Disallowed Combinations Using a Script.
Use this approach to enter disallowed combinations using the filter interface. Alternatively, you can paste a script as shown in Specify Disallowed Combinations Using a Script.
1.
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Select Use Disallowed Combinations Filter.
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2.
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3.
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4.
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Click OR.
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5.
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6.
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You have added the constraint that an ISDN line on the receiving phone (Far) cannot use interface A.
7.
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Click OR.
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8.
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9.
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Figure 19.12 Completed Disallowed Combinations Filter
Alternatively, you can specify disallowed combinations by constructing a script. After loading your factors (Load Factors), do the following:
1.
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Click Continue.
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2.
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Select Use Disallowed Combinations Script.
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(Near Phone == "ISDN" & Near Interface == "A") |
(Far Phone == "ISDN" & Far Interface == "A") |
(Near Phone == "Bus" & Near Interface == "B") |
(Near Phone == "Res" & Near Interface == "B")
Figure 19.13 Completed Disallowed Combinations Script Window
1.
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From the red triangle menu, select Set Random Seed.
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2.
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3.
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Click Make Design.
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Figure 19.14 Metrics Outline for Phone Design
4.
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Click Make Table.
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Figure 19.15 Covering Array Design Table