In statistical quality control, the regression control chart allows for monitoring a change in a process where two or more variables are correlated. The change in a dependent variable can be detected and compensatory change in the independent variable

Independent variable

The terms "dependent variable" and "independent variable" are used in similar but subtly different ways in mathematics and statistics as part of the standard terminology in those subjects...

 can be recommended. Examples from the Post Office Department provide an application of such models.

Regression control chart differs from a traditional control chart

Control chart

Control charts, also known as Shewhart charts or process-behaviour charts, in statistical process control are tools used to determine whether or not a manufacturing or business process is in a state of statistical control.- Overview :...

in four main aspects:

1. It is designed to control a varying (rather than a constant) average.
2. The control limit lines are parallel to the regression line rather than the horizontal line.
3. The computations here are much more complex.
4. It is appropriate for use in more complex situations.