Six Sigma SPC's Quality Control Dictionary and Glossary
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Contingency Table

A diagram built to arrange test results into various groups so that when performing a comparison evaluation one can determine if the grouping is different for any given confidence level.

There should be baseline measurements made to establish a benchmark to base the 'given confidence level' on.

Also see the U.S. The National Institute of Standards and Technology page called How can we compare the results of classifying according to several categories?

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