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Reference.org
Regression control chart
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<p>In <a href="/facts/Statistical_quality_control/Qwkqg5d4">statistical quality control</a>, the regression control chart allows for monitoring a change in a process where two or more variables are <a href="/facts/Correlation_and_dependence/egkluAEm">correlated</a>. The change in a <a href="/facts/Dependent_variable/dINfzIF2">dependent variable</a> can be detected and compensatory change in the <a href="/facts/Independent_variable/dINfzIF2">independent variable</a> can be recommended. Examples from the Post Office Department provide an application of such models. </p>