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  • ISO
    ISO 7870-6:2024 Control charts - Part 6: EWMA control charts for the process mean
    Edition: 2024
    $344.69
    / user per year

Content Description

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).



About ISO

ISO, the International Organization for Standardization, brings global experts together to agree on the best way of doing things – for anything from making a product to managing a process. As one of the oldest non-governmental international organizations, ISO has enabled trade and cooperation between people and companies all over the world since 1946. The International Standards published by ISO serve to make lives easier, safer and better.
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