ENBIS-17 in Naples

9 – 14 September 2017; Naples (Italy) Abstract submission: 21 November 2016 – 10 May 2017

The Problems with Construction and Interpretation of Shewhart Control Charts

11 September 2017, 16:40 – 17:00

Abstract

Submitted by
Vladimir Shper
Authors
Vladimir Shper (Moscow Institute of Steel & Alloys), Yuri Adler (Moscow Institute of Steel & Alloys)
Abstract
In this paper we discuss the problems of using Shewhart Control Charts (SCC) in numerous applications. We enlist and classify the main problems one encounters in practice, explain our view on the causes of these problem emergence and suppose the ways to avoid or mitigate the confusion due to misusing of SCC. There are both well-known (e.g., the collection and use of baseline data in Phase I) and little-known (e.g., the importance of point order) issues within the scope of our analysis. And we try to establish the link between different issues because we are sure that many of them are caused by a general systemic reason: misunderstanding the difference between the so-called analytic and enumerative studies. Though our attention is focused firstly on the help to practitioners some problems within statistical community are analyzed as well. Examples from real processes and some results of simulations are also presented. Our main goal is to decrease the gap between the theory and practice in the area of statistical process control (SPC).
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