Regression control chart
# Regression control chart

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

## Difference

Regression control chart differs from a traditional control chart in four main aspects:

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