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- Title
A critique of the use of modified and moving average‐based EWMA control charts.
- Authors
Haq, Abdul; Woodall, William H.
- Abstract
We show that the so‐called modified exponentially weighted moving average (EWMA) control chart is very closely related to a moving average‐based EWMA chart. These charts have ill‐advised weighting functions that assign more weight to some past data values than to the most recent data values. We show that these weighting functions adversely affect their run length properties and that one can obtain better overall performance with an ordinary EWMA chart.
- Subjects
QUALITY control charts; CUSUM technique; MONTE Carlo method; MOVING average process
- Publication
Quality & Reliability Engineering International, 2023, Vol 39, Issue 4, p1269
- ISSN
0748-8017
- Publication type
Article
- DOI
10.1002/qre.3290