A Robust Estimator for Location in Phase I Based on an EWMA Chart

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)302-316
Journal / PublicationJournal of Quality Technology
Volume46
Issue number4
Publication statusPublished - Oct 2014
Externally publishedYes

Abstract

In practice, a control chart for process monitoring (Phase II) is based on parameters estimated from data collected on the process characteristic under study (Phase l). The Phase I data could contain unacceptable data, which in turn could affect the monitoring. In this study, we consider various estimation methods that are potentially relevant within the parameter estimation process. The quality of the Phase I study is evaluated in terms of the precision of the resulting estimates as well as the effectiveness of the exploratory data analysis, where 'effectiveness' is measured by the proportion of observations that are correctly identified as unacceptable. Moreover, we study the impact of the Phase I estimation method on the performance of the EWMA control chart in Phase II.

Research Area(s)

  • Control Chart, Estimation, Monitoring, Statistical Process Control, WEIGHTED MOVING AVERAGE

Citation Format(s)

A Robust Estimator for Location in Phase I Based on an EWMA Chart. / Zwetsloot, Inez M.; Schoonhoven, Marit; Does, Ronald J. M. M.

In: Journal of Quality Technology, Vol. 46, No. 4, 10.2014, p. 302-316.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review