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ISO 7870-6:2024

Current Revision

Control charts - Part 6: EWMA control charts for the process mean

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This document covers EWMA control charts, originally proposed by Roberts (1959)[16], as a statistical process control technique to detect small shifts in the process mean. It makes possible the faster detection of small to moderate shifts in the process mean. In this chart, the process mean is evaluated in terms of exponentially weighted moving average of all previous observations or averages.

The EWMA control chart’s application is worthwhile in particular when

—     production rate is slow,

—     a minor or moderate shift in the process mean is vital to be detected,

—     sampling and inspection procedure is complex and time consuming,

—     testing is expensive, and

—     it involves safety risks.

NOTE            EWMA control charts are applicable for both variables and attributes data. The given examples illustrate both types (see 5.5, Annex A, Annex B and Annex C).


SDO ISO: International Organization for Standardization
Document Number ISO 7870
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO/TC 69/SC 4
Publish Date Document Id Type View
Not Available ISO 7870-6:2024 Revision
Not Available ISO 7870-6:2016 Revision