Exclusive Content & Downloads from ASQ

Evaluate Control Procedures by Examining Errors in Process Adjustment

Summary: A procedure is proposed for use in evaluating the effect of various control chart procedures. This consists of breaking the power curve associated with a particular control chart technique into four component parts. These are:

  • y1 - probability of undercorrecting
  • y2 - probability of overcorrecting, but still improving
  • y3 - probability of overcorrecting in excess
  • y4 - probability of adjusting in the wrong direction
These components will be illustrated for a number of situations including Shewhart charts, partial correction procedures, geometrically weighted moving averages, cumulative sums, and an example which includes variability associated with the adjustments and variability in the process before adjustment.

Anyone with a subscription, including Site and Enterprise members, can access this article.

Other Ways to Access content:

Join ASQ

Join ASQ as a Full member. Enjoy all the ASQ member benefits including access to many online articles.

Subscribe to Journal of Quality Technology

Access this and ALL OTHER Journal of Quality Technology online articles. You'll also receive the print version by mail.

  • Topics:
  • Keywords: Error,Moving average chart,Cumulative sum control chart (CUSUM),Control charts,Control limits
  • Author: Jackson, J. Edward
  • Journal: Journal of Quality Technology