International Standard
ISO 7870-6:2024
Control charts — Part 6: EWMA control charts for the process mean
Reference number
ISO 7870-6:2024
Edición 2
International Standard
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ISO 7870-6:2024
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Publicado (Edición 2, 2024)

ISO 7870-6:2024

ISO 7870-6:2024
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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).

Informaciones generales

  •  : Publicado
     : 2024-07
    : Norma Internacional publicada [60.60]
  •  : 2
     : 24
  • ISO/TC 69/SC 4
  • RSS actualizaciones

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