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Control charts using minima instead of averages Willem Albers and Wilbert C.M. Kallenberg
 

Summary: Control charts using minima instead of averages
Willem Albers and Wilbert C.M. Kallenberg
Department of Applied Mathematics
Faculty of Electrical Engineering, Mathematics and Computer Science
University of Twente
P.O. Box 217, 7500 AE Enschede
The Netherlands
Abstract
Traditional control charts are commonly based on the
averages of the inspected groups of observations. It
turns out to be quite worthwhile to consider alternative
approaches. In particular, a very good proposal is to
use instead the group minimum for comparison to
some suitable upper limit (and likewise the group
maximum for comparison to a lower limit). The power
of detection during Out-of-Control of the resulting
chart is comparable to that of the standard Shewhart
approach, while it offers much better protection to the
effects of parameter estimation and/or nonnormality
than the traditional methods.

  

Source: Al Hanbali, Ahmad - Department of Applied Mathematics, Universiteit Twente

 

Collections: Engineering