ASQ

Exclusive Content & Downloads from ASQ

A Change-Point Model for a Shift in Variance

Summary: [This abstract is based on the authors' abstract.]A control chart is proposed for detecting shifts in variance in a process where the nominal value of the variance is unknown. The chart is a variance-change-point model adapted for repeated sequential use. It may be used alone to monitor one-degree-of-freedom chi-square variates for departure from control or together with a parallel change-point methodology for the mean to monitor process data for shifts in mean or variance.

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: Average run length (ARL),Cumulative sum control chart (CUSUM),Variable control charts,Likelihood methods,Shewhart control chart,Exponentially weighted moving average (EWMA)
  • Author: Hawkins, Douglas M.; Zamba, K.D.
  • Journal: Journal of Quality Technology