Statistical Advisor, Regression Control Charts
Use QUALITY CONTROL. This chapter discusses when to construct a regression control chart.
The general idea of the regression control chart is as follows: Suppose one is monitoring the relationship between the number of parts produced and the number of work hours expended. Within reasonable limits, on may expect that the greater the number of work hours, the more parts are produced. One could randomly draw 5 sample work days from each month, and monitor that relationship. The control limits established in the regression control chart will allow one to detect, when the relationship changes, for example, when productivity drops and more work hours are necessary to produce the same number of parts.