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5. Process Improvement
5.5. Advanced topics
5.5.9. An EDA approach to experimental design |Effects| plot

Numerical significance

10 % of the largest effect Note the height of the largest bar (= the magnitude of the largest effect). Declare as "significant" any effect that exceeds 10 % of the largest effect. The 10 % is arbitrary and has no statistical (or engineering) basis, but it does have a "numeric" basis in that it results in keeping the largest effect and any effects that are within 90 % of the largest effect.
Apply with caution As with any rule-of-thumb, some caution should be used in applying this critierion. Specifically, if the largest effect is in fact not very large, this rule-of-thumb may not be useful.
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