Six Sigma SPC's Quality Control Dictionary and Glossary
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Linear Graph

A graphical tool pioneered by Yuin Wu to assist in the assignment of variables or causes and relations in a trial environment or an orthogonal, ("statistically independent"), array for future experimentation. The linear graph aids in showing a two dimensional relationship.

Can be used in SPC, (statistical process control) and six sigma.

For an example in chemistry using Excel see this Reed College page.

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