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Journal of Quality Technology
A Quarterly Journal of Methods, Applications and Related Topics
Volume 33, 2001 - Issue 2
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Articles

Monitoring Process Mean and Variability with One EWMA Chart

Gemai ChenUniversity of Regina, Regina, SaskatchewanS4S 0A2, CanadaView further author information
,
Smiley W. ChengUniversity of Manitoba, Winnipeg, ManitobaR3T 2N2, CanadaView further author information
&
Hansheng XieUniversity of Manitoba, Winnipeg, ManitobaR3T 2N2, CanadaView further author information
Pages 223-233 | Published online: 20 Feb 2018
 
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Abstract

Two EWMA charts are usually required to monitor both process mean and variability. In this paper, we propose a new EWMA chart which effectively combines the usual two EWMA charts into one chart. In particular, the new EWMA chart has the property that it is effective in detecting both increases and decreases in mean and/or variability.

Additional information

Notes on contributors

Gemai Chen

Dr. Chen is an Associate Professor in the Department of Mathematics and Statistics. He is a Member of ASQ. His email address is [email protected].

Smiley W. Cheng

Dr. Cheng is a Professor in the Department of Statistics. He is a Senior Member of ASQ.

Hansheng Xie

Mr. Xie is a Research Associate in the Department of Statistics.

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