Talk:Control chart/Archives/2014

Other control charts besides Shewhart ones

Shewhart charts are most common in control charting because of their relative simplicity (over other charts), and therefore are an excellent jumping off point. However, there are control charts (CUSUM, EWMA, and multivariate forms of CUSUM, EWMA, and Shewhart charts) which differ considerably from the basic rules being introduced here. The article in its present form is very much targeted to Shewhart control charts and overlooks the fact that there are other types of control charts which also test to see whether a process mean or variance has shifted. Significant amounts of information need to be added to this article, and I envision much of the content presently in this one moving to a new article titled Shewhart control charts. I am going to try to add a little bit to this article to get it started. --Statwizard 15:03, 23 March 2006 (UTC)

Real-time contrasts chart

I have located a copy of the paper introducing real-time contrasts (RTC) on ResearchGate. In this paper, the authors state that "the control limit UCL is selected so that ARL0 is approximately 200," which is consistent with the statement in this article that the RTC chart "detect[s] smaller changes more efficiently." It seems that this statement could be cleaned up in this Wikipedia article, but I am unsure how best to incorporate this into the article. Any suggestions? Tom Hopper (talk) 15:42, 17 January 2014 (UTC)