Browsing by Author "Trietsch, Dan"
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- ItemOpen AccessThe rate of false signals in X-bar control charts with estimated limits(American Society for Quality, 2007) Bischak, Diane; Trietsch, DanThe in-control statistical properties of X-bar charts have usually been studied from the perspective of the average run length (ARL) until the first (false) signal, known as the in-control ARL. We argue that the ARL is a confusing concept when used with charts with estimated limits and that the rate of false signals (RFS), which focuses on the behavior of charts during extended use, is more intuitive. We use the RFS to illustrate graphically the dangers of using too few subgroups to estimate control limits. We also discuss diffidence charts, which make the inherent uncertainty concerning RFS observable to the practitioner and thus help the practitioner determine what is an acceptable number of subgroups for a given charting application.
- ItemOpen AccessThe Theory of Constraints in Academia: It's Evolution, Influence, Controversies, and Lessons(Neilson Journals Publishing, 2008) Balakrishnan, Jaydeep; Cheng, Chun Hung; Trietsch, DanThe ‗Theory of Constraints‘ (TOC)—more appropriately described as Management by Constraints (MBC)—is a case of a development that has raised an interesting debate in the field of Operations Management. Points of debate include how much of TOC is a ‗refocus‘, how effective it has been, and how it relates and compares to other developments in Operations Management. In this paper, we focus on what lessons academics may learn about disseminating controversial developments from the debate that has accompanied TOC. With the tremendous information explosion, we may see more such controversial developments. Therefore examining the case of TOC may help academics, the people who are expected to play an important role in dissemination, to deal with similar developments in the future, in a balanced and critical manner.